JP2000235245A - Light source device for film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device which can be manufactured at a low cost by using inexpensive parts and also which can cope with photographing with a small light quantity. SOLUTION: A strobe light emitting part 30 is constituted of a low voltage light source constituted of three primary colors light emitting diodes; a red light emitting diode 41a, a green light emitting diode 41b and a blue light emitting diode 41c, a reflector 42 for efficiently reflecting the light of the light emitting diodes toward an object, a light emitting part box 43 for storing the light source and the reflector, and a protector 44 attached to the opening front side of the light emitting part box 43. By simultaneously emitting light by the three-primary color light emitting diodes 41a to 41c, the red light, the green light and the blue light mix together through the protector 44 so as to become white light nearly equal to natural light, then, the object is illuminated by the light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a light source device for a film unit with a lens, and more particularly to a type of a light source.

[0002]

2. Description of the Related Art A variety of lens-equipped film units which incorporate a simple photographing mechanism such as a photographing lens, a shutter mechanism, and a film winding mechanism and are loaded with a photographic film in advance are sold. In this film unit with a lens, a strobe device is incorporated as a light source device.
There is also a film unit with a lens equipped with a strobe that enables shooting at night or in backlight.

A conventional strobe device for a film unit with a lens is composed of a flash discharge tube, a large-capacity capacitor, a boosting circuit for charging, and the like. It irradiates a strobe light.

[0004]

However, the flash tube and the large-capacity capacitor constituting the conventional strobe device have a high component cost and cause an increase in the manufacturing cost of the film unit with the lens, which is a problem. Was.

[0005] As a usage mode of the film unit with a lens, recently, the number of users who perform a self-portrait photographing in which the photographing lens is photographed by pointing the photographing lens toward the photographer with the arm extended is increasing. In such close-up photography, there is a problem that the amount of light is too large with the conventional strobe light generated by the flash discharge tube, and the subject appears whitish.

An object of the present invention is to provide a light source device for a film unit with a lens which can be manufactured at low cost with inexpensive parts and which can be used for photographing with a low light quantity. With the goal.

[0007]

In order to solve the above problems, the present invention comprises a light emitting unit for illuminating a subject, a circuit board for controlling light emission of the light emitting unit, and a battery for supplying power. In the light source device for a film unit with a lens attached to the main body of the film unit with a lens, the light emitting unit comprises a low voltage light source that does not use power from a high voltage circuit having a booster circuit or a capacitor as a power source. . Further, the light emitting section constituted by the low voltage light source emits light before a shutter operation by operating a release button of the film unit with the lens.

Further, a light source for a film unit with a lens, comprising a light emitting unit for illuminating a subject, a circuit board for controlling light emission of the light emitting unit, and a battery for supplying electric power, is attached to a main body of the film unit with a lens. In the device, the light-emitting unit comprises a low-voltage light source and a flash discharge tube that do not use power from a high-voltage circuit including a booster circuit and a capacitor, and emits light by switching between the low-voltage light source and the flash discharge tube. Things. Further, the low voltage light source is a light bulb having a light emitting diode and a filament.

[0009]

FIG. 2 is an external perspective view showing a film unit with a lens incorporating a light source device according to the present invention, and FIG. 3 is an exploded perspective view thereof. The lens-fitted film unit 2 includes a unit main body 3 in which a photographic film is loaded in advance and various photographing mechanisms are incorporated, and a label 4 partially covering the unit main body 3.

A shutter button 5 and a counter window 6 are provided on an upper surface of the unit main body 3, and a finder 7, a photographing lens 8, a light source light emitting section 30 constituting the light source device 15 and the like are provided on a front surface. A hoisting knob 9 that is rotated from one frame to another is exposed from the rear side.

The label 4 is a strip of paper with an adhesive applied to the back surface, and is attached so as to be wound around the center of the unit body 3. The label 4 has an opening for exposing the photographing lens 8, the finder 7, the counter window 6, and the like to the outside, and is printed with a method of using the lens-equipped film unit 2 and notes on use.

The unit main body 3 includes a main body 13 into which the film cartridge 12 is loaded, an exposure unit 14 and a light source device 15 mounted on the front of the main body 13.
And a front cover 16 and a rear cover 17 which are exterior covers assembled on the front and rear sides so as to sandwich the main body 13 therebetween. The front cover 16 and the rear cover 17 are made thinner as a whole to reduce the cost of the film unit with lens 2 and to reduce the size and weight.

The film cartridge 12 comprises a plastic cartridge body 19 and a photographic film 20 housed in the cartridge body 19. This film cartridge 12 conforms to a standard called an advanced photo system. When not in use, the photographic film 20 is entirely housed in the cartridge body, and the photographic film 20 is wound around in the cartridge body 19. By rotating the spool 21 in the film feeding direction, the photo film 20 can be fed from the cartridge body 19. As the photographic film 20, a film having high sensitivity such as ISO 1600 or 3200 is used.

A photographing lens 8 is provided at the center of the main body base 13.
Is provided with a light-shielding tube 22 that shields the photographing optical path from to the photographic film 20. On the front side of the light-shielding tube 22, subject light transmitted through the photographing lens 8 is placed on the photographic film 2.
An opening 24 leading to zero is formed, and an aperture defining an exposure range to the photographic film 20 is formed on the back side.

On both sides of the light-shielding tube 22, a cartridge chamber 26 and a film roll chamber 27 for accommodating the cartridge body 19 and the rolled photographic film 20 at the manufacturing stage are integrally formed. ing. At the lower part of the rear cover 17, a bottom lid 28 of the cartridge chamber 26,
The film roll chamber 27 and the bottom lid 29 are formed integrally. The bottom cover 29 is opened when removing the film cartridge 12 from the used film unit 2 with lens.

A winding knob 9 is rotatably mounted on the upper part of the cartridge chamber 26. The hoisting knob 9 has a drive shaft formed on the lower surface and a cartridge main body 19.
Is engaged with the spool 21. Then, the photo film 20 is wound up by the spool 21 by being rotated counterclockwise in the drawing every time one frame is shot. Although not shown, light-shielding lids for opening and closing the film entrance of the cartridge body 19 in conjunction with opening of the bottom lid 28 when removing the film cartridge 12 from the cartridge chamber 26 are provided on the upper surface and side surfaces of the cartridge chamber 26. A light-shielding lid closing mechanism is incorporated.

The exposure unit 14 has a shutter charge mechanism, a shutter release mechanism, a film unwinding mechanism, and a film count mechanism integrally incorporated with the photographing lens 8 and the finder lens 33. Then, it is detachably attached to the front surface of the light-shielding tube 22 of the main body 13 by engaging a claw.

The rear cover 17 is detachably attached to the back of the main body 13 to shield the inside of the main body 13 from light. On the inner wall surface of the rear cover 17, a film supporting surface 17a for supporting the rear surface of the photo film 20 behind the aperture, a passage surface 17b for forming a film passage together with the rear surface of the main body 13 and the like are formed.

The front cover 16 is formed integrally with the shutter button 5 and is detachably mounted on the front side of the main body 13. Further, an opening 39 for exposing the light source light emitting portion 30 of the light source device 15 to the outside is formed in a front corner portion of the front cover 16.

FIG. 1 is a perspective view showing a light source device according to the present invention, and FIG. 4 is a circuit diagram simply showing an electric configuration of the light source device. The light source device 15 includes a light source light emitting unit 30, a light source circuit board 35, and a battery 36.

The light source light emitting section 30 includes a red light emitting diode 4
1a, a green light emitting diode 41b, and a blue light emitting diode 41c, a light emitting diode of three primary colors, a reflector 42 for efficiently reflecting light of the light emitting diode on the subject side, a light emitting box 43 for accommodating these, and a front surface of an opening of the light emitting box 43 And a protector 44 attached to the protector 44.

Light emitting diodes 41a-41c of three primary colors
Simultaneously emit red light, green light, and blue light mixed by the protector 44 to illuminate the subject as white light close to natural light. The protector 44 is attached to the front surface of the opening of the light emitting unit box 43, with the engagement plates 44 a provided at the top and bottom engaged with the engaging claws 43 a of the light emitting unit box 43.

On the light source circuit board 35, an LED driver 45 for controlling the light emitting diodes 41a to 41c of the three primary colors is formed. The LED driver 45 is connected to a synchro switch 46 that turns on and off in response to opening and closing of a shutter blade (not shown) of the exposure unit 14.

One end of the light source circuit board 35 has a positive contact piece 4
7 a and a negative electrode contact piece 47 b are provided, and a battery 36 serving as an operation power supply of the light source device 15 is held.

Next, the operation of the film unit with a lens including the light source device having the above-described configuration will be described. When shooting with the film unit 2 with a lens, the winding knob 9
Is turned to set an unexposed photographic frame on the aperture. After checking the photographic range by looking through the finder 7, the shutter button 5 is pressed. When the shutter button 5 is operated, the shutter blades of the exposure unit 14 open and close.

When the shutter blades of the exposure unit 14 open and close, the synchro switch 46 on the light source circuit board 35 constituting the light source device 15 turns on and off. Then, LED
The driver 45 controls the red light emitting diode 41a, the green light emitting diode 41b, and the blue light emitting diode 41c.
Light-emitting diodes of the three primary colors are simultaneously turned on for a certain period of time.

The red light, green light and blue light emitted from the three primary color light emitting diodes 41a to 41c are mixed by the protector 44 to become white light close to natural light, and illuminate the subject. Then, the image of the subject illuminated with the white light is exposed on a photographic frame of the photographic film 20.

Such light emitting diodes 41a-41
Although the amount of light by c is smaller than that of strobe light by a conventional flash discharge tube, since the photographic film 20 is of high sensitivity such as ISO 1600 or 3200, shortage of exposure may not occur. In addition, a clear image can be captured by the light emitting diode. Note that a relatively low-sensitivity photographic film was used, and the photographic lens 8 was used with the arm extended.
If you use it for close-up photography, such as when shooting a self-portrait that shoots the photographer himself, or when shooting a very close subject, overexposure due to excessive light amount,
A clear close-up photographing can be performed without the subject appearing whitish.

On the other hand, by using the light emitting diodes 41a to 41c as described above as the light source of the light source device, costly components such as a flash discharge tube and a large-capacity capacitor, which have increased the cost of the conventional strobe device, are used. Need not be used, and the light source device 15 can be composed of low-cost components such as light-emitting diodes, so that the film unit with lens 2 can be manufactured at lower cost.

In the above-described embodiment, a light emitting diode is used as a light source of the light source device. In addition, for example, a high voltage circuit including a booster circuit or a capacitor such as a tungsten lamp or a halogen lamp may be used. Any low-voltage light source that does not use electric power may be used.

FIG. 5 is a perspective view showing a second embodiment of the light source device for a film unit with a lens according to the present invention.
FIG. 6 is a circuit diagram simply showing the electrical configuration.
The light source light emitting section 52 of the light source device 51 of the present embodiment is provided with two types of light sources, a flash discharge tube 53 and a low-voltage light source including light emitting diodes 54a to 54c of three primary colors of red, green and blue. Of these, the flash discharge tube 53 is a light source for illuminating the subject during film exposure, and the light emitting diodes 54a to 54c are light sources for preventing red-eye.

On the light source circuit board 55, there are provided a strobe circuit 56 composed of a capacitor and a booster circuit for emitting light from the flash discharge tube 53, and an LED driver 57 for emitting the light emitting diodes 54a to 54c of the three primary colors. It is formed.

A battery 58 for supplying power to both the strobe circuit 56 and the LED driver 57 is connected to a lower portion of the light source circuit board 55. The flash circuit 56 is connected to a synchro switch 61 that turns on and off in conjunction with opening and closing of shutter blades of the film unit with a lens.

A pre-emission switch 62 is connected to the LED driver 57. The pre-emission switch 62 is provided below the release button 63 of the film unit with a lens, and a position where the release button 63 is not pressed,
When the release button 63 is pressed halfway down to near the middle of the position where the shutter mechanism operates when the release button 63 is pressed down (chain line A in FIG. 6), the light emitting diodes 54a to 54c are turned on.

With the above configuration, when performing light source photography, when the photographer presses the release button 63 halfway,
The pre-emission switch 62 is turned on, and the LED driver 5
7, the light emitting diodes 54a to 54c of the three primary colors emit light at the same time, are mixed by the protector 65, and illuminate the subject as white light for preventing red-eye. As a result, the pupil of a human being as a subject is narrowed to prevent red eyes.

When the photographer pushes the release button 63 down (chain line A in FIG. 6), the shutter mechanism operates to open and close the shutter blades. Then, the synchro switch 61 is turned on, and the flash circuit 56 is connected to the flash discharge tube 5.
3 is caused to emit light.

The subject is illuminated by the flash light of the flash discharge tube 53, and the subject image is exposed on the photographic film.
At this time, the red-eye preventing light-emitting diodes 54a to 54c pre-emit light before the flash discharge tube 53 emits light to narrow the pupil of a human being as a subject, so that the red-eye phenomenon is prevented.

In these embodiments, the light emitting diodes of the three primary colors of red, green and blue are simultaneously emitted in order to obtain white light, but a white light emitting diode may be used. Further, any number of light emitting diodes may be provided so as to obtain a necessary light amount. In addition, other than a light emitting diode as a low voltage light source, any low voltage light source that does not use power from a high voltage circuit including a booster circuit or a capacitor, such as a tungsten lamp or a halogen lamp, may be used. May be used.

The light source of the film unit with a lens is provided with two light sources, a flash discharge tube and a light emitting diode,
At the time of self-photographing, a light emitting diode may be used as a light source. As shown in FIG. 7, the film unit with lens 6
On the front surface of the camera 1, a shooting mode switching lever 63 for switching a shooting mode between normal shooting and self shooting is provided.

When the photographing mode switching lever 63 is slid leftward to set the self-photographing mode, the finder 6
The convex mirror 64 is inserted into the front side of the second mirror 2. This convex mirror 64
In the self-photographing, the photographer checks whether his / her face is properly in the photographing range. The photographing mode switching lever 63 is linked to a light source selection switch 68 provided in a circuit connected to a synchro switch 67 of a strobe circuit for causing a flash discharge tube 69 to emit light in the circuit diagram of the light source device of the film unit with lens 61 shown in FIG. are doing. When the photographing mode switching lever 63 is set to the self-photographing mode, the light source selection switch 68 is turned off, and even if the synchro switch 67 is operated and turned on, this is invalidated.

With such a configuration, the film unit with lens 61 allows the photographer to switch the photographing mode switching lever 63.
Is set to the self-photographing mode, the light source selection switch 68 is turned off. When the photographer's own exposure range is checked with the convex mirror 64 and the shutter button 66 is operated, the synchro switch 67 of the light source circuit is turned on simultaneously with the shutter operation, but the light source selection switch 68 is turned off by the shooting mode switching lever 63. , The flash discharge tube 69 does not emit light. Then, L below the shutter button 66
The switch for operating the ED driver is turned on, and only the light emitting diode 70 having a light intensity lower than that of the flash discharge tube 69 emits light as a light source.

Thus, even in self-photographing at a close distance, clear self-photographing can be performed without failure of photographing due to excessive exposure due to too strong flash light.

[0043]

As described above, according to the present invention, a light emitting unit for illuminating a subject, a circuit board for controlling light emission of the light emitting unit, and a battery for supplying electric power are provided. In the strobe device for a film unit with a lens attached to the unit, the light emitting unit is composed of a light emitting diode, so that it can be manufactured at low cost with inexpensive parts, and for a film unit with a lens corresponding to shooting at a low light quantity. A strobe device can be provided.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a light source device for a film unit with a lens according to the present invention.

FIG. 2 is an external perspective view showing a film unit with a lens incorporating the light source device of FIG. 1;

FIG. 3 is an exploded perspective view of FIG. 2;

FIG. 4 is a circuit diagram schematically illustrating an electrical configuration of the light source device of FIG. 1;

FIG. 5 is an external perspective view illustrating a light source device according to a second embodiment.

FIG. 6 is a circuit diagram schematically illustrating an electrical configuration of the light source device of FIG. 5;

FIG. 7 is an external perspective view showing a film unit with a lens incorporating a light source device according to a third embodiment.

FIG. 8 is a circuit diagram schematically showing the electrical configuration of FIG. 7;

[Explanation of symbols]

 2 Film unit with lens 3 Unit main body 15 Light source device 16, 41 Front cover 17 Rear cover 30 Light source light emitting unit 36 Battery 41a Red light emitting diode 41b Green light emitting diode 41c Blue light emitting diode 44 Protector 45 LED driver 46 Synchro switch

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H053 AB00 AB02 AD03 BA01 BA06 CA00 CA02 CA03 CA18 CA45 DA00 2H101 AA09

Claims (4)

[Claims] 1. A light source for a film unit with a lens, comprising: a light emitting unit for illuminating a subject; a circuit board for controlling light emission of the light emitting unit; and a battery for supplying power, and attached to a main body of the film unit with a lens. A light source device for a film unit with a lens, characterized in that the light-emitting unit is constituted by a low-voltage light source that does not use power from a high-voltage circuit including a booster circuit or a capacitor as a power source. 2. The lens-equipped film unit according to claim 1, wherein the light-emitting unit composed of the low-voltage light source emits light before a shutter operation by operating a release button of the lens-equipped film unit. Light source device. 3. A light source for a film unit with a lens, comprising a light emitting unit for illuminating a subject, a circuit board for controlling light emission of the light emitting unit, and a battery for supplying electric power, and being attached to a main body of the film unit with a lens. In the apparatus, the light-emitting unit comprises a low-voltage light source and a flash discharge tube that do not use power from a high-voltage circuit including a booster circuit or a capacitor, and emits light by switching between the low-voltage light source and the flash discharge tube. A light source device for a lens-fitted film unit. 4. The light source according to claim 1, wherein the low voltage light source is a light bulb having a light emitting diode and a filament.
Light source device for film unit with lens according to any one of (1) to (3).