Back to results
US 9,541,756 B2Granted
Optical apparatus, image forming apparatus, and image reading apparatus
AssigneeCanon Kabushiki Kaisha
InventorsTakeyoshi Saiga, Masayasu Teramura, Yu Miyajima
Life of this patent
Estimating the term…
Abstract
An optical apparatus includes: a light source including multiple light-emitting points arrayed in a first direction; and an imaging optical system including multiple lens optical systems arrayed in the first direction. The imaging optical system forms images of the multiple light-emitting points on a light-receiving surface. In a first cross-section and in a second cross-section, half-value of a maximum value of angle of divergence of an imaging optical flux input to the light-receiving surface, resolution, and a size of each image of the plurality of light-emitting points formed on the light-receiving surface, satisfy predetermined conditions.
Claims19
An optical apparatus comprising:
- a light source including a plurality of light-emitting points arrayed in a first direction;
- and
- an imaging optical system including a plurality of lens optical systems arrayed in the first direction wherein the imaging optical system forms images of the plurality of light-emitting points on a light-receiving surface;
- and
- wherein a condition of
- 0.8
- ≤
- P
- m
- P
- s
-
- 1
- -
- P
- s
-
- D
- s
- 1
- -
- P
- m
-
- D
- m
-
- tan
-
-
- θ
- m
- tan
-
-
- θ
- s
- ≤
- 1.2
- is satisfied, where
- in a first cross-section which is parallel to the first direction and an axial direction of the lens optical systems, θm represents a half-value of a maximum value of angle of divergence of an imaging optical flux input to the light-receiving surface, Pm [lp/mm] represents resolution, and Dm [mm] represents a size of each image of the plurality of light-emitting points, formed on the light-receiving surface, and
- in a second cross-section which is perpendicular to the first direction, θs represents a half-value of a maximum value of angle of divergence of an imaging optical flux input to the light-receiving surface, Ps [lp/mm] represents resolution, and Ds [mm] represents a size of each image of the plurality of light-emitting points, formed on the light-receiving surface.
39 more elements
An optical apparatus comprising:
- a light source including a plurality of light-emitting points arrayed in a first direction;
- and
- an imaging optical system including a plurality of lens optical systems arrayed in the first direction,
- wherein the imaging optical system forms images of the plurality of light-emitting points on a light-receiving surface, and
- wherein a condition of
- 0.8
- ≤
- P
- m
- P
- s
-
- 1
- -
- P
- s
-
- D
- s
- 1
- -
- P
- m
-
- D
- m
-
- n
- m
-
- P
- T
- ≤
- 1.2
- is satisfied, where
- in a first cross-section which is parallel to the first direction and an axial direction of the lens optical systems, p [mm] represents an array pitch of the plurality of lens optical systems, nm represents the maximum number of lens optical systems through which light rays from one of the plurality of light-emitting points pass, Pm [lp/mm] represents resolution, and Dm [mm] represents a size of each image of the plurality of light-emitting points, formed on the light-receiving surface, and
- in a second cross-section which is perpendicular to the first direction, T [mm] represents the maximum effective width of the imaging optical system, Ps [lp/mm] represents resolution, and Ds [mm] represents a size of each image of the plurality of light-emitting points, formed on the light-receiving surface.
34 more elements
An image forming apparatus comprising:
- an optical apparatus including
- a light source including a plurality of light-emitting points arrayed in a first direction, and
- an imaging optical system including a plurality of lens optical systems arrayed in the first direction,
- wherein the imaging optical system forms images of the plurality of light-emitting points on a light-receiving surface,
- wherein a condition of
- 0.8
- ≤
- P
- m
- P
- s
-
- 1
- -
- P
- s
-
- D
- s
- 1
- -
- P
- m
-
- D
- m
-
- tan
-
-
- θ
- m
- tan
-
-
- θ
- s
- ≤
- 1.2
- is satisfied, where
- in a first cross-section which is parallel to the first direction and an axial direction of the lens optical systems, θm represents a half-value of a maximum value of angle of divergence of an imaging optical flux input to the light-receiving surface, Pm [lp/mm] represents resolution, and Dm [mm] represents a size of each image of the plurality of light-emitting points, formed on the light-receiving surface, and
- in a second cross-section which is perpendicular to the first direction, θs represents a half-value of a maximum value of angle of divergence of an imaging optical flux input to the light-receiving surface, Ps [lp/mm] represents resolution, and Ds [mm] represents a size of each image of the plurality of light-emitting points, formed on the light-receiving surface;
- a developing unit configured to develop an electrostatic latent image, formed on a photosensitive surface disposed on a photosensitive member, by the optical apparatus as a toner image;
- a transfer unit configured to transfer the developed toner image to a transfer medium;
- and
- a fixing unit configured to fix the transferred toner image into the transfer medium,
- wherein the imaging optical system is disposed such that the second direction perpendicular to the first direction and optical axis direction of the lens optical systems is the rotational direction of the photosensitive member.
44 more elements
An optical apparatus comprising:
- an imaging optical system including a plurality of lens optical systems arrayed in the first direction,
- wherein the imaging optical system forms images of a document on a light-receiving surface, and
- wherein a condition of
- 0.8
- ≤
- P
- m
- P
- s
-
- tan
-
-
- θ
- m
- tan
-
-
- θ
- s
- ≤
- 1.2
- is satisfied, where
- in a first cross-section which is parallel to the first direction and an axial direction of the lens optical systems, θm represents a half-value of a maximum value of angle of divergence of an imaging optical flux input to the photoreception unit, and Pm [lp/mm] represents resolution, and
- in a second cross-section which is perpendicular to the first direction, θs represents a half-value of a maximum value of angle of divergence of an imaging optical flux input to the light-receiving surface, and Ps [lp/mm] represents resolution.
22 more elements
An optical apparatus comprising:
- an imaging optical system including a plurality of lens optical systems arrayed in the first direction,
- wherein the imaging optical system forms an image of a document on a light-receiving surface, and
- wherein a condition of
- 0.8
- ≤
- P
- m
- P
- s
-
- n
- m
-
- p
- T
- ≤
- 1.2
- is satisfied, where
- in a first cross-section which is parallel to the first direction and an axial direction of the lens optical systems, p [mm] represents an array pitch of the plurality of lens optical systems, nm represents the maximum number of lens optical systems through which light rays from one of the plurality of light-emitting points pass, Pm [lp/mm] represents resolution, and
- is a second cross-section perpendicular to the first cross-section, T [mm] represents the maximum effective width of the imaging optical system, and Ps [lp/mm] represents resolution.
17 more elements
An image reading apparatus comprising:
- an optical apparatus including
- an imaging optical system including a plurality of lens optical systems arrayed in a first direction,
- wherein the imaging optical system forms images of the plurality of light-emitting points on a light-receiving surface,
- wherein a condition of
- 0.8
- ≤
- P
- m
- P
- s
-
- tan
-
-
- θ
- m
- tan
-
-
- θ
- s
- ≤
- 1.2
- is satisfied, where
- in a first cross-section which is parallel to the first direction and an axial direction of the lens optical systems, θm represents a half-value of a maximum value of angle of divergence of an imaging optical flux input to the light-receiving surface, and Pm [lp/mm] represents resolution, and
- in a second cross-section which is perpendicular to the first direction, θs represents a half-value of a maximum value of angle of divergence of an imaging optical flux input to the light-receiving surface, and Ps [lp/mm] represents resolution;
- an illumination unit configured to irradiate the document;
- a photoreceptor unit disposed at the image plane of the imaging optical system, configured to receive light rays of the document on which light has been condensed by the imaging optical system;
- and
- a driving unit configured to change a relative position between the imaging optical system and the document in a second direction perpendicular to the first direction and the optical axis direction of the lens optical system.
27 more elements
Dependencies are inferred from the claim text.