# US 12,595,894 B2 · Light source device with fly-eye integrator

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- Number: US 12,595,894 B2
- Document ID: US12595894B2
- Status: Granted
- Kind: B2
- Application number: 19/074,940
- Filed: 2025-03-10
- Published: 2025-09-11
- Granted: 2026-04-07
- Earliest claimed: 2024-03-11
- Assignees: Ushio Denki Kabushiki Kaisha
- Applicants: Ushio Denki Kabushiki Kaisha
- Inventors: Takeo Matsushima
- Web page: https://patentgrep.com/patent/US12595894B2

## CPC

- F21V 5/008: {Combination of two or more successive refractors along an optical axis}
- G03B 21/2013: {Plural light sources}
- F21V 5/007: {Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane (combination of two or more refractors F21V5/008)}
- G02B 3/0006: {Arrays (G02B3/02, G02B5/188 take precedence)}
- G02B 19/0014: {at least one surface having optical power}
- G02B 19/0066: {in the form of an LED array}
- G02B 27/0961: {Lens arrays (lens arrays per se G02B3/0006)}
- G02B 27/30: Collimators
- G03B 21/208: {Homogenising, shaping of the illumination light}
- F21Y 2115/10: Light-emitting diodes [LED]
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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

Some parameters are defined that a focal length of the condensing optical system is f, a width orthogonal to an optical axis and having a maximum width of the collimating optical system is b, an axis coinciding with a line segment constituting the width b is an axis B, a width of a projection image on an axis optically equivalent to the axis B is a, the projection image being on a light emitting surface on a back focus surface of the condensing optical system, and a separation distance between an incident surface of the fly eye lens and a back focus of the condensing optical system is L, the light source device satisfies a predetermined formula.

## Claims

### Claim 1

A light source device with fly-eye integrator comprising:
a plurality of light emitting elements;
a collimating optical system that includes a plurality of lens regions each disposed corresponding to each of the plurality of light emitting elements at a subsequent stage of the plurality of light emitting elements and collimates light from a front focus of the lens regions;
a condensing optical system that condenses light emitted from the collimating optical system; and
a fly eye lens on which the light emitted from the condensing optical system is incident, wherein,
it is defined that a focal length of the condensing optical system is f, a width orthogonal to an optical axis and having a maximum width of the collimating optical system is b, an axis coinciding with a line segment constituting the width b is an axis B, a width of a projection image on an axis optically equivalent to the axis B is a, the projection image being on a light emitting surface on a back focus surface of the condensing optical system, and a separation distance between an incident surface of the fly eye lens and a back focus of the condensing optical system is L, the light source device satisfies the following Formula (1)
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1
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b
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L
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### Claim 2 (depends on 1)

The light source device with fly-eye integrator according to claim 1, wherein, it is defined that a minimum width of an incident surface of the fly eye lens is D, the width D satisfies the following Formula (2)
[
Math
⁢
2
]
D
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b
⁢
❘
"\[LeftBracketingBar]"
L
❘
"\[RightBracketingBar]"
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.
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2
)