# US 4,399,490 A · Opaque reflector for multilamp photoflash array

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- Number: US 4,399,490 A
- Document ID: US4399490A
- Status: Granted
- Kind: A
- Application number: 06/238,867
- Filed: 1981-02-27
- Granted: 1983-08-16
- Earliest claimed: 1981-02-27
- Assignees: GTE Products Corporation
- Inventors: David R. Broadt
- Web page: https://patentgrep.com/patent/US4399490A

## CPC

- G03B 15/0442: {Constructional details of the flash apparatus; Arrangement of lamps, reflectors, or the like (G03B15/0484 takes precedence)}
- 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)

## Abstract

A multilamp photoflash unit includes a housing member having a plurality of lamp-receiving cavities of a relatively opaque material with a reflective surface adjacent the lamp whereby back radiation from the lamp is reduced. Also, a reflector having cavities of opaque pigmented plastic resin material and a reflective surface may be disposed within a plastic housing and serve to inhibit back radiation from a lamp.

## Claims

### Claim 1

A photoflash array having a housing member containing a reflector unit which includes at least one cavity formed to receive a flashlamp and characterized by the improvement wherein said cavity includes a pair of spaced sidewalls with a reflective material on said pair of spaced sidewalls substantially normal to the opening thereof and on the surface thereof immediately adjacent said flashlamp and is formed from a relatively opaque pigmented plastic resin material selected from the group consisting of carbon black and titanium dioxide whereby back radiation of light energy is inhibited.

### Claim 2

A photoflash array having a housing member which includes a back portion and a light transmitting front portion, said back portion having at least one cavity therein formed to receive a flashlamp, said cavity of said housing member having a reflective surface immediately adjacent said flashlamp and characterized by the improvement wherein a pair of spaced sidewalls are substantially normal to the opening of said cavity and a relatively opaque pigmented plastic resin material selected from the group consisting of carbon black and titanium dioxide is used to form said cavity of said back portion.

### Claim 3 (depends on 2)

The photoflash array of claim 2 wherein said cavity includes a pair of spaced sidewalls in a plane substantially normal to the plane of said photoflash array.