Lens-fitted photo film unit and electronic flash device for use

Details Lens-fitted photo film unit and electronic flash device for use Lens-fitted photo film unit and electronic flash device for use

1997-11-28

1999-02-23

Metjahic, Safet

Photography

Disposable or recyclable camera

396167, G03B 1702

Patent

active

058753575

ABSTRACT:
A lens-fitted photo film unit has an electronic flash device (11, 30; 115) with a printed circuit board (173). The flash device includes a flash-emitting section (6, 170) for emitting flash light toward a photographic field, and a main capacitor (31, 155) for storing charge to be discharged in the flash-emitting section. The printed circuit board converts a current of a battery (12, 127) into a current of high voltage to be supplied to the main capacitor. The printed circuit board has a transistor (13, Tr1) for oscillation. A primary winding (15) has one end connected to the battery, and another end connected to a collector of the transistor. A secondary winding (16) is combined in mutual induction with the primary winding, has one end connected to the main capacitor, and another end connected to a base of the transistor. A tertiary winding (17) is combined in mutual induction with the secondary winding, has one end connected to the battery, and another end connected to the base of the transistor. An LED (21, 180) has a cathode connected to the one end of the tertiary winding with the battery, and an anode connected to the another end of the tertiary winding opposite to the battery. The LED is driven to emit light in response to charging of the main capacitor at a predetermined level. In a preferred embodiment, the photo film unit is pre-loaded with photo film (123) having speed of ISO 800 or higher, to allow the main capacitor to have small capacitance adapted to the high speed of the photo film.

REFERENCES:
patent: 3476029 (1969-11-01), Schreckendgust
patent: 3906526 (1975-09-01), Toyoshima et al.
patent: 4051494 (1977-09-01), Fujita et al.
patent: 4068150 (1978-01-01), Iwata et al.
patent: 4101914 (1978-07-01), Yamashita et al.
patent: 4106037 (1978-08-01), Nakamura et al.
patent: 4174898 (1979-11-01), Iijima
patent: 4218120 (1980-08-01), Kawamura et al.
patent: 4311371 (1982-01-01), Kobori et al.
patent: 4350420 (1982-09-01), Engelsmann et al.
patent: 4431288 (1984-02-01), Iwata et al.
patent: 4478502 (1984-10-01), Nakai
patent: 4609269 (1986-09-01), Kamata
patent: 4945368 (1990-07-01), Ishino et al.
patent: 4999663 (1991-03-01), Nakamura
patent: 5047792 (1991-09-01), Asano et al.
patent: 5063402 (1991-11-01), Shimada et al.
patent: 5107287 (1992-04-01), Swayze
patent: 5181057 (1993-01-01), Takagi et al.
patent: 5235364 (1993-08-01), Ohmura et al.
patent: 5270754 (1993-12-01), Newman
patent: 5410378 (1995-04-01), Tasaka et al.
patent: 5432572 (1995-07-01), Hirasaki et al.
patent: 5466560 (1995-11-01), Sowinski et al.

Affiliated with

Also associated with

Rating

Lens-fitted photo film unit and electronic flash device for use does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Lens-fitted photo film unit and electronic flash device for use , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lens-fitted photo film unit and electronic flash device for use will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-315175