Patent EP0174879A1 successfully refreshed from Google Patents.
Patent EP0082691B1 successfully refreshed from Google Patents.
EP0082691B1
Expired / Lapsed
EP
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An illuminating device having optical light guide formed as fibre bundle
Assignee: Olympus Corp
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Filing: 1982-12-17
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Granted: 1986-04-16
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Expires: 2002-12-17
Abstract
Abstract An illuminating device including an optical light guide in the form of a fibre bundle, and a light source having a condenser lens to incident the incidence end surface of the fibre bundle is disclosed. An optical reflecting body having a peripheral reflecting portion is attached to the incidence end surface of the fibre bundle. Parameters of the lens and the optical reflecting body are determined to decrease light loss and to uniformly distribute light on the incidence end surface. The relation between the parameters is represented as formulae which in one case is applicable when the light intensity distribution of the bright spot image is peaked and in another case is applicable when the distribution is substantially flat.
Inventors
- 👤 Akiyoshi Takami
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 22:58
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/4296; A; A61; A61B; A61B1/00; A61B1/06; A61B1/07; G02B6/4298; A61B1/00163; A61B1/00165; A61B1/00167; A61B1/0017
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
186 words
An illuminating device including a light source (9), and optical light guide formed as a fibre bundle (1) for conducting illuminating light from the light source (9) to an object to be illuminated, and a light source lens (10) for directing said illuminating light from the light source (9) to said fibre bundle (1), characterized in that an optical reflecting body (17) made of transparent optical material (17") and having a peripheral reflecting portion is mounted on the incident end surface (4) of said fibre bundle (1), and in that said lens (10) and said optical reflecting body (17) are determined to satisfy the formula: in which: I=height of bright spot image (12), S=air equivalent length between bright spot image (12) and incident end surface (18) of the optical reflecting body (17) and is positive when measured in a direction from the incident end surface (18) towards the fibre bundle (1), d=l e ngth of the optical reflecting body (17), n=refractive index of the optical reflecting body (17), a=angle of marginal ray (19) relative to the optical axis, and r=effective radius of the fibre bundle (1).
Claim 2
Dependent Claim
186 words
An illuminating device including a light source (9), and optical light guide formed as a fibre bundle (1) for conducting illuminating light from the light source (9) to an object to be illuminated, and a light source lens (10) for directing said illuminating light from the light source (9) to said fibre bundle (1), characterized in that an optical reflecting body (17) made of transparent optical material (17") and having a peripheral reflecting portion is mounted on the incident end surface (4) of said fibre bundle (1), and in that said lens (10) and said optical reflecting body (17) are determined to satisfy the formula: in which: I=height of bright spot image (12), S=air equivalent length between bright spot image (12) and incident end surface (18) of the optical reflecting body (17) and is positive when measured in a direction from the incident end surface (18) towards the fibre bundle (1), d=l e ngth of the optical reflecting body (17), n=refractive index of the optical reflecting body (17), a=angle of marginal ray (19) relative to the optical axis, and r=effective radius of the fibre bundle (1).
Claim 3
Dependent Claim
80 words
An illuminating device according to claim 1, - characterised in that it meets the additional condition: in which: h=height of upper side ray (20) on the incident end surface (18) of the optical reflecting body (17), and r= rad i us 6f the optical reflecting body (17). 3. An illuminating device according to claim 1 or 2, in which said light source lens (10) is axially displaceably mounted relative to the light source (14) to regulate the bright spot image.
Claim 4
Dependent Claim
35 words
An illuminating device according to any of claims 1 to 3, in which the numerical aperture of the optical reflecting body (17) is the same as or greater than that of said fibre bundle (1).
Claim 5
Dependent Claim
32 words
An illuminating device according to any of claims 1 to 3, in which the diameter of the optical reflecting body (17) is greater than the effective diameter of said fibre bundle (1).
Claim 6
Dependent Claim
43 words
An illuminating device according to any preceding claim, in which said optical reflecting body (17) and said fibre bundle (1) are adhered to one another by an adhesive having the same or a similar refractive index as that of said optical reflecting body.
Claim 7
Dependent Claim
48 words
An illuminating device according to any preceding claim, in which both end surfaces of the optical reflecting body and the incident end surface of the fibre bundle are coated with a reflection-decreasing layer having the same or a similar refractive index as that of the optical reflecting body.
References Cited (Backward Citations)
No citation records indexed.
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