Light emitting element array substrate with reflecting means

• US 5,283,425 A
• Filed: 01/29/1993
• Issued: 02/01/1994
• Est. Priority Date: 02/06/1992
• Status: Expired due to Term

• Current Assignee: ROHM Co., Ltd.
• Original Assignee: ROHM Co., Ltd.
• Inventors: Imamura, Masaya
• Primary Examiner(s): Messinger, Michael
• Application Number:
  US08/010,761
• Time in Patent Office: 368 Days
• Field of Search: 250/208.1, 250/216, 250/578.1, 358/475, 257/98, 257/88, 257/84, 355/67, 355/70, 355/71
• US Class Current: 250/208.1
• CPC Class Codes: G09F 13/22 electroluminescent electroluminescent light sources per se H05B33/00
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H05B 45/40 Details of LED load circuits

Abstract

A light emitting element array substrate includes a plurality of light emitting elements arranged in line on the substrate with less dispersion in irradiation to a surface to be irradiated and can be manufactured with a reduction of cost. The light emitting element array substrate also includes light reflecting members formed on the light emitting element array substrate about light emitting elements having less irradiation. The light reflecting members re-reflect the light emitted from the light emitting elements and also reflected by surrounding parts so that the quantity of light at portions of the light emitting element array substrate having less irradiation is complemented by the re-reflected light to level the entire irradiation in the light emitting element array substrate.

Claims

1. A light emitting element array substrate comprising a plurality of light emitting elements arranged on the substrate in a line and light reflecting means provided on a portion of said substrate around light emitting elements where the quantity of irradiation is less than that at an other portion of the substrate, said light reflecting means positioned to re-reflect the light which is emitted from said light emitting elements and then reflected by surrounding parts, so that said re-reflected light complements the quantity of light where the irradiation is less than the other portions and levels the entire irradiation from the light emitting element array substrate.

2. A light emitting element array substrate as defined in claim 1 wherein said light reflecting means is formed on said substrate about the light emitting element at each end.

3. A light emitting element array substrate as defined in claim 1 wherein said light reflecting means is formed of thermosetting resin and has color and brightness sufficient to reflect the light in the light emitting elements of the wavelength that is used more than the other wavelengths.

4. A light emitting element array substrate as defined in claim 1 wherein said light reflecting means is formed of aluminum film.

5. A light emitting element array substrate as defined in claim 1 wherein said light reflecting means has a size sufficient to level the irradiation from all of said light emitting elements.

6. An electronic instrument comprising a light emitting element array substrate which includes a plurality of light emitting elements arranged on said substrate in a line, said light emitting element array substrate further including light reflecting means provided on a portion of said substrate around light emitting elements where the quantity of irradiation is less than that at an other portion of the substrate, said light reflecting means positioned to re-reflect the light which is emitted from said light emitting elements and then reflected by surrounding parts, so that said re-reflected light complements the quantity of light where the irradiation is less than the other portion and levels the entire irradiation from the light emitting element array substrate.

7. An electronic instrument as defined in claim 6 wherein said light reflecting means is formed on said substrate about the light emitting element at each end.

8. An electronic instrument as defined in claim 6 wherein said light reflecting means is formed of thermosetting resin and has color and brightness sufficient to reflect the light in the light emitting elements of the wavelength which is used more than the other wavelengths.

9. An electronic instrument as defined in claim 6 wherein said light reflecting means is formed of aluminum film.

10. An electronic instrument as defined in claim 6 wherein said light reflecting means has a size sufficient to level the irradiation from all of said light emitting elements.

11. An electronic instrument comprising an image sensor for irradiating light to an object to be sensed and receiving the reflected light to convert the image of said object into electrical signals, said electronic instrument further comprising:

(a) a transparent cover on which said object is placed;

(b) a light emitting section for irradiating light to said object through the transparent cover, said light emitting section including light reflecting means provided on a portion of said substrate around light emitting elements where the quantity of irradiation is less than that at an other portion to the substrate, said light reflecting means positioned to re-reflect the light which is emitted from said light emitting elements and then reflected by surrounding parts, so that said re-reflected light complements the quantity of light where the irradiation is less than the other portion and levels the entire irradiation from the light emitting element array substrate;

(c) a condensing lens for receiving and condensing the light reflected by said object through said transparent cover;

(d) a light receiving section for receiving and converting the light from said condensing lens into electrical signals; and

(e) a main frame on the top of which said transparent cover is mounted, said main frame enclosing said light emitting section, condensing lens and light receiving section.

12. An electronic instrument as defined in claim 11 wherein said light reflecting means is formed on said substrate about the light emitting element at each end.

13. An electronic instrument as defined in claim 11 wherein said light reflecting means is formed of thermosetting resin and has color and brightness sufficient to reflect the light in the light emitting elements of the wavelength which is used more than the other wavelengths.

14. An electronic instrument as defined in claim 11 wherein said light reflecting means is formed of aluminum film.

15. An electronic instrument as defined in claim 11 wherein said light reflecting means has a size sufficient to level the irradiation from all of said light emitting elements.