JP2000162739A - Film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a film unit with a lens equipped with a strobe light emitting function without hindering photographing. SOLUTION: This film unit is equipped with a photographing lens 5 guiding light to loaded film and exposing the film, an exposure mechanism 15 provided with a release button 11 operated to be depressed, and opening a shutter by the depressing of the button 11, and a stroboscopic device 7 provided with a strobe light emitting device 8 emitting the light when the film is exposed. The film has high sensitivity of >= ISO 640 and the γ value of the film is <=0.55, and the lens 5 is set to such a stop value as F5.6 to 8, then the device 8 is set to emit the light at a G-number 1 to 5. The shutter is set to be actuated at such shutter speed as 1/400 to 1/100 sec.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film unit with a lens which can be reduced in size.

[0002]

2. Description of the Related Art Film units equipped with a lens are provided with a built-in strobe device in order to perform photographing in an environment where the amount of light is insufficient such as at night or in the dark.
The strobe device is a strobe light emitter that emits strobe light,
The electronic device includes a capacitor for supplying power to the strobe light, a battery for charging the capacitor, and a strobe substrate having a control unit for controlling light emission of the strobe light.

Further, the film loaded in the film unit with a lens is a film having a normal sensitivity, and the strobe light emitter needs to emit light sufficiently to prevent the film from being underexposed. For this reason, a capacitor having a large capacity is used for supplying power to the strobe light emitter.

[0004]

As described above, in the conventional film unit with a lens, since the strobe light emitter needs to emit a large amount of light, a large-capacity capacitor is required. It is large. As a result, the conventional lens-equipped film unit incorporating a strobe device has a problem that miniaturization is limited.

On the other hand, it is conceivable to load a high-sensitivity film or brighten the aperture value of the photographing lens to suppress the light emission amount of the strobe light emitting device.
Even if the photographing is performed, the film tends to be overexposed, and a new problem that the photographing fails occurs.

The present invention has been made in view of such a conventional problem. Even if the light emission amount of the strobe light emitting device is suppressed, it is possible to perform photographing without failure without underexposure. It is an object of the present invention to provide a lens-equipped film unit that can be downsized.

[0007]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 has a photographing lens for guiding light to a loaded film to expose the film, and a release button to be pressed down, An exposure mechanism that opens a shutter by pressing a release button, and a strobe device having a strobe light emitter that emits light when the film is exposed, wherein the film has a high sensitivity of ISO 640 or more and a γ value of 0. 55 or less, and the photographing lens is F5.6.
And the strobe light is set to 1-5.
, And the shutter is operated at a shutter speed of 1/400 to 1/100 second.

In the present invention, since the film has a high sensitivity and the photographing lens is set to a bright aperture value, the G number of the strobe light emitter can be set to 1 to 5. With the G number in this range, the condenser of the strobe device becomes small, and the entire film unit with lens can be downsized.

In addition, since the shutter operates at a high speed, overexposure does not occur even when photographing in a bright environment such as during the daytime or outdoors, and photographing does not fail.

According to a second aspect of the present invention, there is provided a photographing lens for guiding light to a loaded film to expose the film, an exposure mechanism having a release button operated to be pressed, and opening a shutter by pressing the release button. And a strobe device having a strobe light emitting device that emits light when the film is exposed, wherein the strobe light is disposed immediately above the taking lens.

According to the present invention, since the strobe light emitter is disposed immediately above the taking lens, the entire strobe device including the strobe light emitter is placed behind the taking lens. An exposure mechanism is arranged on the back side of the taking lens, and a strobe device is incorporated together with the exposure mechanism, so that a space dedicated to the strobe device is not required. For this reason, the film unit with a lens can be reduced in size.

According to a third aspect of the present invention, the strobe device comprises:
A strobe light source is provided with a condenser for supplying electric power to emit light, and a strobe board for controlling light emission of the strobe light emitter. The strobe light emitter, the condenser and the strobe board are arranged so as to surround the taking lens. It is characterized by the following.

In the present invention, since the strobe light emitter, the condenser and the strobe circuit are arranged so as to surround the taking lens, a space for arranging them is not required in the thickness direction. For this reason, the film unit with a lens can be reduced in thickness.

The invention according to a fourth aspect is characterized in that the release button also functions as a strobe switch for starting charging of the strobe device.

In the present invention, since the release button also functions as a strobe switch, the capacitor is charged by pressing the release button, and the strobe switch becomes unnecessary. Therefore, the operability is improved and the number of components can be reduced.

[0016]

FIG. 1 is an overall front view of an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof. The lens-fitted film unit 1 is configured by covering the unit body 2 with a front cover 3 and a rear cover 4.

At the center of the front cover 3, a photographing lens 5 is provided.
The lens window 6 into which the lens is inserted is opened. Lens window 6
(That is, the photographing lens 5), a strobe device 7
And a finder 9 are disposed. The strobe light emitter 8 is disposed immediately above the taking lens 5, and the finder 9 is disposed at a side (right side) of one side of the strobe light emitter 8. Further, in order to dispose the strobe light emitter 8 directly above the taking lens 5, a light emission window 10 into which the strobe light emitter 8 is fitted is opened directly above the lens window 6 (see FIG. 2).

A release button 11 is provided on the upper surface of the front cover 3 as a component of the exposure mechanism. In this embodiment, the release button 11 also functions as a flash switch of the flash device 7 described later.

As shown in FIG. 2, the unit body 2 includes a film roll chamber 12 for accommodating a spool (not shown) around which an unexposed film is wound and a cartridge (not shown) for winding the exposed film. Are disposed on the left and right, and an exposure mechanism 15 is provided between them. Further, a photographing frame 16 to which the photographing lens 5 is attached is provided in front of the exposure mechanism 15.

A shutter (not shown) for opening and closing the front surface of the photographing lens 5 is disposed behind the photographing frame 16. When the release button 11 is pressed, the shutter rotates to open the front of the photographic lens 5, and the photographic lens 5 guides light to the film to expose the film. Then, after a lapse of a predetermined time after the release button 11 is pressed, the shutter is rotated back to rotate the photographing lens 5.
Block the front of the.

The strobe device 7 includes a strobe light emitting device 8 and a capacitor 1 for supplying power to the strobe light emitting device 8 for light emission.
7 and a strobe substrate 18 having a control unit for controlling light emission of the strobe light emitter 8. Reference numeral 19 denotes a charging completion indicator lamp such as an LED for notifying the completion of charging the capacitor 17. Note that a battery 20 is incorporated to charge the capacitor 17.

In this strobe device 7, the strobe substrate 1
8 is vertically long, the strobe light emitter 8 is on the upper side surface of the strobe board 18, and the condenser 17 is the strobe board 1.
8 is attached to the lower side surface. The strobe light emitter 8 and the condenser 17 are mounted on the side of the strobe board 18 on the side of the photographing lens 5. When the strobe device 7 is mounted on the unit body 2, the strobe light emitter 8, the strobe board 18 and the condenser 17 are photographed. It is arranged so as to surround the lens 5. By arranging the strobe light emitter 8, the condenser 17, and the strobe circuit 18 so as to surround the taking lens 5, a space for arranging them is not required in the thickness direction. For this reason, the film unit with a lens can be reduced in thickness.

In the above embodiment, the film, the photographing lens 5, the strobe light emitter 8, and the shutter are set under the following conditions.

First, a film having a high sensitivity of ISO 640 or more and a γ value of 0.55 or less is used. By using a high-sensitivity film, even if the brightness of the subject is small, it can be exposed, and the γ value is 0.5
By setting it to 5 or less, there is an advantage that the photosensitive width is widened.

Next, the photographing lens 5 is set to an aperture value of F5.6-8. The F number is a value obtained by dividing the equivalent focal length of the lens by the diameter of the entrance pupil of the lens.

The G number of the strobe light emitter 8 is 1 to
5 and the strobe light emitter 8 emits light with the G number in this range. As mentioned above, the film has high sensitivity,
In addition, since the taking lens 5 is set to an aperture value of F5.6 to 8, even if the strobe light is emitted within the G number range of 1 to 5, underexposure does not occur and the exposure to the film is sufficient. What can be done.
With the G number in such a range, the power supplied to the strobe light emitter 8 can be reduced, and the capacitor 17 for this purpose can be reduced in size. For this reason, the entire film unit with lens 1 can be reduced in size.

Further, the shutter is 1/400 to 1/1.
It is set to operate at a shutter speed of 00 seconds.
Since the film has high sensitivity and the taking lens 5 has a bright aperture value, the shutter is operated at high speed. This allows you to shoot in bright environments such as during the day or outdoors,
There is no overexposure and there is no failure to shoot.

By setting the film, the photographing lens 5, the strobe light emitter 8, and the shutter speed under the above conditions, in this embodiment, the film unit 1 with the lens can be downsized, and the image quality of the photographed image can be improved. Good and operability can be improved.

When the F value of the photographing lens is F, the shutter speed is T (second), and the ISO sensitivity of the film is S, the reference exposure EV is EV = [log ₁₀ F ² + log].
₁₀ (1 / T) -log ₁₀ (S / 100)] / log ₁₀ 2
The reference exposure amount EV is 10 ≦
It is preferable to select an aperture value, a shutter speed, and a film sensitivity such that EV ≦ 12. In addition, it is desirable to use a strobe light emitting device having a G number of 2 to 3 m so that a subject with proper exposure can be properly exposed.

In this embodiment, as described above, the release button 11 also functions as a flash switch.
The strobe switch of the strobe device 7 becomes unnecessary. This is because the amount of electricity stored in the capacitor 17 for light emission is small because the strobe light emitter 8 emits light with G numbers of 1 to 5, and the capacitor 17 can be charged in a short time of about 3 seconds. That is, because the charging time is short,
This is because the charging of the capacitor 17 can be completed when the release button 11 is pressed, and the strobe light emitter 8 can emit light immediately. By eliminating the need for a strobe switch, operability is improved and
The number of parts is reduced, and the structure can be simplified.

[0031]

As described above, according to the first aspect of the present invention, since the film has a high sensitivity and the photographing lens is set to a bright aperture value, the G number of the strobe light emitter is set to 1 to 5. As a result, the condenser of the strobe device becomes smaller, and the entire film unit with lens can be made smaller. In addition, since the shutter operates at a high speed, overexposure does not occur even when shooting in a bright environment such as during the daytime or outdoors, and shooting does not fail.

According to the second aspect of the present invention, since the strobe light emitter is disposed immediately above the taking lens, a space dedicated to the strobe device is not required, and the film unit with the lens can be downsized.

According to the third aspect of the present invention, since the strobe light emitting device, the condenser and the strobe circuit are arranged so as to surround the taking lens, a space for arranging them is not required in the thickness direction. The unit can be reduced in thickness.

According to the fourth aspect of the present invention, since the release button also functions as a strobe switch, a strobe switch is not required, thereby improving operability and reducing the number of parts.

[Brief description of the drawings]

FIG. 1 is a front view of a film unit with a lens according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Film unit with a lens 5 Shooting lens 7 Strobe device 8 Strobe light emitter 11 Release button 15 Exposure mechanism 17 Condenser 18 Strobe board

Claims (4)

[Claims] 1. A photographing lens for guiding light to a loaded film to expose the film, an exposure mechanism having a release button which is pressed down, and opening a shutter when the release button is pressed, and an exposure mechanism for exposing the film. A strobe device having a strobe light emitting device for emitting light, wherein the film has a high sensitivity of ISO640 or more, the γ value is 0.55 or less, and the photographing lens has an F5.6 to F8.
And the strobe light is set to 1-5 G
A film unit with a lens set to emit light at a number, wherein the shutter operates at a shutter speed of 1/400 to 1/100 second. 2. A photographing lens for guiding light to a loaded film to expose the film, an exposure mechanism having a release button which is pressed down, and opening a shutter by pressing the release button; A strobe device having a strobe light emitter that emits light, wherein the strobe light emitter is disposed immediately above the taking lens. 3. The strobe device includes a capacitor for supplying electric power for causing the strobe light emitter to emit light, and a strobe substrate for controlling light emission of the strobe light emitter.
The film unit with a lens according to claim 2, wherein a strobe light emitter, a condenser, and a strobe board are arranged so as to surround the taking lens. 4. The film unit with a lens according to claim 2, wherein said release button also functions as a strobe switch for starting charging of a strobe device.