# US 8,540,393 B2 · First and second light-emitting elements having identical peak emission intensities

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- Number: US 8,540,393 B2
- Document ID: US8540393B2
- Status: Granted
- Kind: B2
- Application number: 11/890,578
- Filed: 2007-08-07
- Published: 2008-02-14
- Granted: 2013-09-24
- Earliest claimed: 2006-08-09
- Assignees: Olympus Medical Systems Corp.
- Applicants: Kyosuke Mizuno; Shinji Yamashita; Masato Toda
- Inventors: Kyosuke Mizuno; Shinji Yamashita; Masato Toda
- Web page: https://patentgrep.com/patent/US8540393B2

## CPC

- A61B 1/05: characterised by the image sensor, e.g. camera, being in the distal end portion
- A61B 1/0638: {providing two or more wavelengths}
- A61B 1/0655: {Control therefor}
- A61B 1/0669: {at proximal end of an endoscope}
- F21Y 2115/10: Light-emitting diodes [LED]
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED

## Abstract

A light source apparatus includes a first light-emitting element to generate an illumination light with a first light emission intensity to be applied to a subject, and a second light-emitting element to generate an illumination light with a second light emission intensity, including at least light with a wavelength different from the illumination light generated from the first light-emitting element. The first light-emitting element and second light-emitting element are arranged, so that the peaks of the first emission intensity and second emission intensity become identical.

## Claims

### Claim 1

A light source apparatus comprising:
a plurality of first light-emitting elements which emit a first illumination light including a light with a first wavelength to be applied to a subject, and which are located in a position at a first distance from an image-pickup element; and
a plurality of second light-emitting elements which emit at least a second illumination light including a light with a second wavelength that is different from the first wavelength of the light included in the first illumination light emitted from the first light-emitting elements, and which are located in a position at a second distance, different from the first distance, from the image-pickup element,
wherein the respective light-emitting elements have light emission intensities that vary so that a peak portion of a first light emission intensity obtained by combining the first illumination lights emitted from the plurality of first light-emitting elements in a direction parallel to a surface direction, in which the plurality of first light-emitting elements and the plurality of second light-emitting elements are arranged, coincides with a peak portion of a second light emission intensity obtained by combining the second illumination lights emitted from the plurality of second light-emitting elements in a direction parallel to the surface direction in an angle of view of the image pickup element.

### Claim 2 (depends on 1)

The light source apparatus of claim 1, wherein the plurality of first light-emitting elements and the plurality of second light-emitting elements are arranged and emit light so that the peak portion of the first light emission intensity and the peak portion of the second light emission intensity coincide with a center of the image pickup element which picks up the image of the subject.

### Claim 3

A light source apparatus comprising:
a plurality of first light-emitting elements which emit a first illumination light including a light with a first wavelength to be applied to a subject, and which are located in a position at a first distance from an image-pickup element; and
a plurality of second light-emitting elements which emit at least a second illumination light including a light with a second wavelength that is different from the first wavelength of the light included in the first illumination light emitted from the first light-emitting elements, and which are located in a position at a second distance, different from the first distance, from the image-pickup element which picks up an image of the subject on a plane identical to that of the plurality of first light-emitting elements,
wherein the respective light-emitting elements have light emission intensities that vary so that a peak portion of a first light emission intensity obtained by combining the first illumination lights emitted from the plurality of first light-emitting elements in a direction parallel to a surface direction, in which the plurality of first light-emitting elements and the plurality of second light-emitting elements are arranged, coincides with a peak portion of a second light emission intensity obtained by combining the second illumination lights emitted from the plurality of second light-emitting elements in a direction parallel to the surface direction in a position on the plane.

### Claim 4 (depends on 3)

The light source apparatus of claim 3, wherein the plurality of first light-emitting elements and the plurality of second light-emitting elements are arranged and emit light so that the peak portion of the first light emission intensity and the peak portion of the second light emission intensity coincide with a center of the image pickup element which picks up the image of the subject.

### Claim 5

A light source apparatus comprising:
a plurality of first light-emitting elements which emit a first illumination light including a light with a first wavelength to be applied to a subject;
a plurality of second light-emitting elements which emit at least a second illumination light including a light with a second wavelength that is different from the first wavelength of the light included in the first illumination light emitted from the first light-emitting elements; and
a control unit which controls amounts of lights emitted from the plurality of first light-emitting elements and the plurality of second light-emitting elements so that a peak portion of a first light emission intensity obtained by combining the first illumination lights emitted from the plurality of first light-emitting elements coincides with a peak portion of a second light emission intensity obtained by combining the second illumination lights emitted from the plurality of second light-emitting elements,
wherein each of the plurality of first light-emitting elements and the plurality of second light-emitting elements has a plurality of peak portions in a direction parallel to a surface direction in which the light-emitting elements are arranged, and the plurality of first light-emitting elements and the plurality of second light-emitting elements are located in positions at different distances from an image-pickup element which picks up an image of the subject, and
the control unit controls the amounts of lights emitted from the plurality of first light-emitting elements and the plurality of second light-emitting elements so that the peak portion of the first light emission intensity obtained by combining the first illumination lights emitted from the plurality of first light-emitting elements coincides with the peak portion of the second light emission intensity obtained by combining the second illumination lights emitted from the plurality of second light-emitting elements in an angle of view of the image pickup element.

### Claim 6 (depends on 5)

The light source apparatus of claim 5, wherein the control unit performs one of control of adjusting an amount of light of one light-emitting element in association with an amount of light of another light emitting element and control of independently adjusting an amount of light of one light-emitting element and an amount of light of another light-emitting element.