US 5,197,105 A · Method of reading optical image of inspected surface and image reading system employabale therein

A method of reading an image of an object with an imaging optical system having a respective angular aperture associated therewith and with an image sensor, comprising the steps of:

(a) providing a light source at a position located within only a portion of said angular aperture of said imaging optical system;
(b) locating said object in a visual field of said imaging optical system;
(c) applying illumination light from said light source to said object, wherein said illumination light reflects on said object to obtain a reflected light;
and
(d) receiving said reflected light by said image sensor through said imaging optical system to thereby obtain an image of said object.

2 more elements

A method of reading respective images of a wiring pattern and a through hole of an printed board having first and second surfaces opposite to each other, in which said wiring pattern is formed on said first surface and said through hole is provided between said first and second surfaces, said method comprising the steps of:

(a) applying a first light having a first wavelength to said first surface of said printed board, wherein said first light is reflected on said wiring pattern to become a reflected light;
(b) applying a second light having a second wavelength to said second surface of said printed board, wherein said second light is transmitted through said through hole to become a transmitted light;
(c) obtaining a compound light consisting of said reflected light and said transmitted light;
(d) leading said compound light to an imaging optical system;
(e) receiving with a light splitter said compound light which has passed through said imaging optical system to split said compound light into said reflected light and said transmitted light;
(f) receiving said reflected light with a first image sensor to obtain an image of said wiring pattern;
and
(g) receiving said transmitted light with a second image sensor to obtain an image of said through hole;
wherein said step (a) comprises the steps of:
(a-1) applying a first component of said first light from a position located within only a portion of an angular aperture of said imaging optical system to said first surface of said printed board;
and
(a-2) applying a second component of said first light from a position outside said angular aperture of said imaging optical system to said first surface of said printed board.

9 more elements

An image reading system for reading respective images of a wiring pattern and a through hole of an printed board having first and second surfaces opposite to each other, in which said wiring pattern is formed on said first surface and said through hole is provided between said first and second surfaces, said image reading system comprising:

(a) an imaging optical system facing said first surface of said printed board;
(b) first light source means facing said first surface of said printed board to emit a first light having a first wavelength to said first surface of said printed board, wherein said first light is reflected on said wiring pattern to become a reflected light;
(c) second light source means facing said second surface of said printed board to emit a second light having a second wavelength to said second surface of said printed board, wherein said second light is transmitted through said through hole to become a transmitted light which is overlapped with said reflected light to obtain a compound light entering said imaging optical system;
(d) light splitter means for receiving said compound light which has passed through said imaging optical system to split said compound light into said reflected light and said transmitted light;
(e) first image sensor means for receiving said reflected light to obtain an image of said wiring pattern;
and
(f) second image sensor means for receiving said transmitted light to obtain an image of said through hole;
wherein said first light source means comprises:
(b-1) first illumination means provided in a position located within only a portion of an angular aperture of said imaging optical system to emit a first component of said first light;
and
(b-2) second illumination means located outside said angular aperture of said imaging optical system to emit a second component of said first light.

8 more elements

An image reading system for reading respective images of a wiring pattern and a through hole of a printed board having first and second surfaces opposite to each other, in which said wiring pattern is formed on said first surface and said through hole is provided between said first and second surfaces, said image reading system comprising:

(a) an imaging optical system facing said first surface of said printed board;
(b) first light source means facing said first surface of said printed board to emit a first light polarized in a first direction to said first surface of said printed board, wherein said first light is reflected on said wiring pattern to become a reflected light;
(c) second light source means facing said second surface of said printed board to emit a second light polarized in a second direction to said second surface of said printed board, wherein said second light is transmitted through said through hole to become a transmitted light which is overlapped with said reflected light to obtain a compound light entering said imaging optical system;
(d) light splitter means for receiving said compound light which has passed through said imaging optical system to split said compound light into said reflected light and said transmitted light;
(e) first image sensor means for receiving said reflected light to obtain an image of said wiring pattern;
and
(f) second image sensor means for receiving said transmitted light to obtain an image of said through hole;
wherein said first light source means comprises:
(b-1) first illumination means provided in a position located within only a portion of an angular aperture of said imaging optical system to emit a first component of said first light;
and
(b-2) second illumination means located outside said angular aperture of said imaging optical system to emit a second component of said first light.

8 more elements

A method of reading respective images of a wiring pattern and a through hole of an printed board having first and second surfaces opposite to each other, in which said wiring pattern is formed on said first surface and said through hole is provided between said first and second surfaces, said method comprising the steps of:

(a) providing an imaging optical system;
(b) providing a selective reflection mirror covering the entirety of an angular aperture of said imaging optical system, wherein
said selective reflecting mirror having a surface which consists of:
a first region capable of reflecting a first light of a first optical character and capable of transmitting a second light of a second optical character;
and
a second region capable of reflecting said first and second lights;
and
said angular aperture of said imaging optical system is divided into two part with a boundary of said first and second regions;
(b) applying said first light from out of an angular aperture of said imaging optical system to said selective reflection mirror to direct said first light to said first surface of said printed board, thereby obtaining a reflected light through reflection of said first light on said wiring pattern;
(c) applying said second light to said second surface of said printed board, thereby obtaining a transmitted light through transmittance of said second light through said through hole;
(d) obtaining a compound light consisting of said reflected light and said transmitted light;
(e) leading said compound light to said imaging optical system through said selective reflection mirror,
(f) receiving with a light splitter said compound light having passed through said imaging optical system to split said compound light into said reflected light and said transmitted light;
(g) receiving said reflected light with a first image sensor to obtain an image of said wiring pattern;
and
(h) receiving said transmitted light with a second image sensor to obtain an image of said through hole.

13 more elements

An image reading system for reading respective images of a wiring pattern and a through hole of an printed board having first and second surfaces opposite to each other, in which said wiring pattern is formed on said first surface and said through hole is provided between said first and second surfaces, said image reading system comprising:

(a) an imaging optical system;
(b) a selective reflection mirror covering whole of an angular aperture of said imaging optical system and comprising a surface which consists of:
a first region capable of reflecting a first light of a first optical character and capable of transmitting a second light of a second optical character;
and
a second region capable of reflecting said first and second lights;
wherein said angular aperture of said imaging optical system is divided into two part with a boundary of said first and second regions;
(c) first light source means provided out of an angular aperture of said imaging optical system, for emitting said first light toward said selective reflection mirror to direct said first light to said first surface of said printed board to obtain a reflected light through reflection of said first light on said wiring pattern;
(d) second light source means provided in the said second surface side, for emitting said second light toward said second surface of said printed board to obtain a transmitted light through transmittance of said second light through said through hole;
wherein said reflected light and said transmitted light are overlapped with each other to form a compound light;
and
said compound light enters said selective reflection mirror and then passes through said imaging optical system;
(e) light splitter means for receiving said compound light having passed through said imaging optical system to split said compound light into said reflected light and said transmitted light;
(f) first image sensor means for receiving said reflected light to obtain an image of said wiring pattern;
and
(g) second image sensor means for receiving said transmitted light to obtain an image of said through hole.

12 more elements

A method of reading respective images of a wiring pattern and a through hole of an printed board having first and second surfaces opposite to each other, in which said wiring pattern is formed on said first surface and said through hole is provided between said first and second surfaces, said method comprising the steps of:

(a) providing an imaging optical system;
(b) providing a selective reflection mirror covering only a part of an angular aperture of said imaging optical system, wherein said selective reflecting mirror is capable of reflecting a first light of a first optical character and capable of transmitting a second light of a second optical character;
(c) applying said first light from out of an angular aperture of said imaging optical system to said selective reflection mirror to direct said first light to said first surface of said printed board, thereby obtaining a reflected light through reflecting of said first light on said wiring pattern;
(d) applying said second light to said second surface of said printed board, thereby obtaining a transmitted light through transmittance of said second light through said through hole;
(e) obtaining a compound light consisting of said reflected light and said transmitted light;
(f) leading said compound light to said imaging optical system through a space in which said selective reflection mirror is located, wherein:
with respect to said reflected light included in said compound light, only a part thereof bypassing said selective reflection mirror is received by said selective reflection mirror;
and
with respect to said transmitted light included in said compound light, both of a first thereof passing through said selective reflection mirror and a second part bypassing said selective reflection mirror are received by said selective reflection mirror;
(g) receiving with a light splitter said compound light having passed through said space to split said compound light into said reflected light and said transmitted light;
(h) receiving said reflected light with a first image sensor to obtain an image of said wiring pattern;
and
(i) receiving said transmitted light with a second image sensor to obtain an image of said through hole.

10 more elements

An image reading system for reading respective images of a wiring pattern and a through hole of an printed board having first and second surfaces opposite to each other, in which said wiring pattern is formed on said first surface and said through hole is provided between said first and second surfaces, said image reading system comprising:

(a) imaging optical system;
(b) a selective reflection mirror covering only a part of an angular aperture of said imaging optical system and capable of reflecting a first light of a first optical characters and capable of transmitting a second light of a second optical character;
(c) first light source means provided out of an angular aperture of said imaging optical system, for emitting said first light toward said selective reflection mirror to direct said first light to said first surface of said printed board and to obtain a reflected light through reflection of said first light on said wiring pattern;
(d) second light source means provided in the said second surface side, for emitting said second light toward said second surface of said printed board to obtain a transmitted light through transmittance of said second light through said through hole;
wherein said reflected light and said transmitted light are overlapped with each other to form a compound light;
said compound light passes through a space in which said selective reflection mirror is provided and then enters said imaging optical system;
with respect to said reflected light includes in said compound light, only a part thereof bypassing said selective reflection mirror is received by said selective reflection mirror;
and
with respect to said transmitted light included in said compound light, both of a first part thereof passing through said selective reflection mirror and a second part bypassing said selective reflection mirror are received by said selective reflection mirror;
(e) light splitter means for receiving said compound light having passed through said imaging optical system to split said compound light into said reflected light and said transmitted light;
(f) first image sensor means for receiving said reflected light with to obtain an image of said wiring pattern;
and
(g) second image sensor means for receiving said transmitted light to obtain an image of said through hole.

10 more elements

Method of reading optical image of inspected surface and image reading system employabale therein

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Method of reading optical image of inspected surface and image reading system employabale therein

Life of this patent

Abstract

Claims47