JP2000352799A - Film unit with lens provided with built-in stroboscope and camera incorporating stroboscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a good-quality picture at the time of electronic flash photographing, to improve the focusing performance at daylight photographing, to prevent a camera shake and to realize the miniaturization of a stroboscope and the reduction of the cost by decreasing the transmitting light quantity to a photographing lens to be equal or above a specified value in the case of switching a stroboscope to a non-acting state. SOLUTION: When a stroboscope is used, a slide lever 18 is actuated rightward and a filter plate 17 is retreated by engagement of a projected part 18a and the slot 17c of the plate 17, so that the exposure hole 16c of a lens receiver 16 is opened and an open aperture is set (A). When the stroboscope is not used, the lever 18 is actuated leftward and the hole 16c of the lens receiver 16 is covered with the plate 17 by the engagement of the projected part 18a with the slot 17c of the plate 17, so that transmitted light quantity to the photographing lens is switched to a filter 17a from the hole 16c, and the light quantity for photographing is decreased. Then, the transmitted light quantity is decreased to >=F13 when converted to F-value by the filter 17a (B).

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 built-in strobe and a camera loaded with an unexposed film in advance and, more particularly, to at least an F-number or a shutter of an aperture in conjunction with switching between an operation state and a non-operation state of the strobe. The present invention relates to a film unit with a built-in strobe and a camera for switching any of the speeds.

[0002]

2. Description of the Related Art A film unit with a built-in flash which switches at least one of an aperture and a shutter speed in response to switching between an operation state and a non-operation state of a strobe is loaded in advance. It is disclosed in Japanese Unexamined Patent Publication No. 8-184944.

[0003] According to this publication, the sensitivity of a film is determined by ISO.
At 400, the f-number of the aperture is switched to F8 when the strobe is in operation and the shutter speed is switched to 1/60, and the f-number of the aperture is F10.5 when the strobe is not in operation.
And the shutter speed is switched to 1/100. In other words, the recommended value is EV10 when the strobe is in operation and EV11.5 when the strobe is not in operation.

[0004]

In the film unit with a lens with a built-in strobe in the above-mentioned publication, the EV is set to EV10 when the strobe is operated. Even if the main subject is properly exposed, the background is shot dark. Therefore, the photograph becomes a photograph in which only the person emerges, and it is hardly a high-quality photograph. The EV is set to 11.5 in a state where the strobe is not operated, that is, in the daytime shooting. However, this is a set value in consideration of the flash shooting, and if the shooting only in the daytime is taken into consideration, the focus performance may be reduced. In order to improve image quality, a larger F-number is preferable, and to prevent camera shake, a faster shutter speed is preferable.

In view of the above problems, the present invention provides a photograph in which the main subject and the background are well-balanced during flash photography, and increases the F-number during daylight photography to improve the focusing performance, thereby achieving a high shutter speed. SUMMARY OF THE INVENTION It is an object of the present invention to propose a film unit with a built-in flash which can prevent camera shake and reduce the size of the flash and reduce the cost by reducing the guide number of the flash.

[0006]

The above object is achieved by one of the following constitutions.

In a film unit with a built-in strobe which has been loaded with an unexposed film in advance, a strobe switching means for switching between an operation state and a non-operation state of the strobe, and switching of the strobe switching means from the strobe operation state to the non-operation state When the strobe is switched to the non-operation state, the transmitted light amount switching means reduces the transmitted light amount to the photographing lens to F13 or more in F value conversion. A film unit with a built-in strobe lens.

In the film unit with a built-in strobe, the transmitted light amount is F when the strobe is operated.
The film unit with a built-in strobe lens according to the above description, wherein the value is set to F8 or less in value conversion.

In a film unit with a built-in strobe which has been loaded with an unexposed film in advance, a strobe switching means for switching between an operation state and a non-operation state of the strobe, and switching of the strobe switching means from the strobe operation state to the non-operation state. Transmission light amount switching means for reducing the transmission light amount in conjunction with the shutter speed switching means for switching the shutter speed to a low speed in response to switching from a strobe operation state to a non-operation state of the strobe switching means,
When the strobe is switched to the non-operation state, the transmitted light amount switching means reduces the transmitted light amount to the photographing lens to F13 or more in terms of F value, or sets the shutter speed to 1 or more.
/ Film unit with built-in flash, characterized in that it is set to 150 seconds or longer.

When the strobe is switched to the operating state, the amount of light transmitted to the photographing lens is switched to F8 or less in terms of F value, and the shutter speed is set to 1/100 second or less. Film unit with lens.

3. The film unit with a built-in flash according to claim 1, wherein the transmitted light amount switching means is an ND filter.

The sensitivity of the unexposed film is ISO 60
The film unit with a built-in strobe lens according to claim 1, wherein the value is 0 or more.

In a camera having a built-in strobe, strobe switching means for switching between an activated state and a non-operated state of the strobe, and a transmitted light amount is reduced in conjunction with switching of the strobe switching means from the strobe operated state to the non-operated state. When the strobe is switched to a non-operating state, the transmitted light amount switching means reduces the transmitted light amount to the photographing lens to F13 or more in F value conversion. Camera.

In the camera with a built-in strobe, the amount of transmitted light is set to F8 or less in terms of F value in the operating state of the strobe.

In a camera having a built-in strobe, strobe switching means for switching between an activated state and a non-operated state of the strobe, and a transmitted light amount is reduced in conjunction with switching of the strobe switching means from the strobe operated state to the non-operated state. A transmission light amount switching unit; and a shutter speed switching unit that switches a shutter speed to a low speed in response to switching of the strobe switching unit from a strobe operation state to a non-operation state. The transmitted light amount switching means sets the transmitted light amount to the photographing lens to F
A camera with a built-in strobe, characterized in that the value is reduced to F13 or more or the shutter speed is set to 1/150 second or more.

(10) When the strobe is switched to the operating state, the amount of light transmitted to the photographing lens is converted to an F value by F8.
A camera with a built-in strobe characterized by switching to the following and setting the shutter speed to 1/100 second or less.

(11) The camera according to (10), wherein the transmitted light amount switching means is an ND filter.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a film unit with a lens according to the present invention will be described in detail with reference to FIGS.
1 is a perspective view of a film unit with a lens, FIG. 2 is an exploded perspective view showing an internal mechanism of the film unit with a lens, FIG. 3 is a front view of a filter plate or the like for switching a transmitted light amount, and FIG. FIG.

As shown in FIG. 1, a film unit 1 with a lens is commercially available in a state where an unexposed film (not shown) is loaded in a manufacturing process in advance. The sensitivity of this film is desirably ISO 600 or higher, and in the present embodiment, the description will be made assuming that a high-sensitivity film of ISO 800 is loaded. However, even if an ISO400 film is loaded, the effects of the present invention can be sufficiently obtained.

In the film unit with lens 1, the front cover 2 and the rear cover 3 are assembled from the front and rear. A photographic lens 4 is provided at the center of the front side, and a finder 5 is provided above the photographic lens 4. A strobe light emission window 6 is provided in the vicinity. The strobe light emission window 6 is disposed at the upper right end, and the distance between the optical axes from the photographing lens 4 is increased to reduce the occurrence of red-eye during strobe shooting. A strobe switch lever 7 is provided below the strobe light emission window 6, and when the strobe switch lever 7 is slid in the direction A, the main switch (not shown) of the strobe is turned on and the main switch is turned off. It can be switched to the inactive state. A grip unit 8 is provided on the right side of the film unit 1 with a lens, and a release button 9 is provided above the grip unit 8.

As shown in FIG. 2, a main body 10 is provided inside the lens-equipped film unit 1 surrounded by the front cover 2 and the rear cover 3. A photographing frame 10a is provided at the center of the main body 10, and a film roll chamber 10b is provided on one of the left and right sides of the photographing frame 10a, and a patrone chamber 10c is provided on the other.

A boss 10d is provided on an upper portion of the main body 10, and a sector lever 12 for driving a sector 11 is rotatably attached to the boss 10d. Locking portion 12a of sector lever 12 and locking protrusion 1 of main body 10
0e, a tension spring 13 is provided, and the tension spring 13 constantly biases the sector lever 12 in a direction to close the sector 11. Sector lever 1
The second protrusion 12b engages with the long groove 11a of the sector 11,
The movement of the sector lever 12 is transmitted to the sector 11. The sector lever 12 is rotated by a release mechanism 14 attached to the main body 10, and the release mechanism 14
Is activated by the release button 9. A spacer 15 is arranged on the front side of the photographing frame 10a of the main body 10, and a lens receiver 16 is arranged on the front side of the spacer 15 by engaging a claw portion 16a with a concave portion 15a of the spacer 15. An exposure window 15 b is formed in the spacer 15, and the sector 11 is arranged between the spacer 15 and the lens receiver 16. In the sector 11, the hole 11b is
The boss 15c is operated by the sector lever 12, and the exposure window 15b can be opened.

The lens mounting portion 16 of the lens receiver 16
b, a photographic lens 4 is assembled.
Exposure hole 16c is formed at a position corresponding to. A filter plate 17 as a transmitted light amount switching unit is set in the lens receiver 16. An ND filter 17a is provided in the filter plate 17, and a mounting hole 17b formed in the filter plate 17 is inserted into a boss (not shown) of the spacer 15 to rotatably support the filter plate 17.
Here, the ND filter is a so-called neutral gray filter that does not selectively absorb the wavelength of incident light, but has a function of uniformly absorbing any wavelength light and reducing the amount of transmitted light. Things. For example, various products are prepared for a single-lens reflex camera, but have basically the same function.

Further, not only the ND filter is inserted into the photographing optical path only when the amount of transmitted light is reduced when the strobe is not emitting light, but also through the ND filter according to the conditions of a built-in film or the like when the strobe is emitting light. You may let it. That is, two types of ND filters having different densities are attached to the filter plate, and one having a low density (a large amount of transmitted light) when the strobe is not used and a high density (a small amount of the transmitted light) when the strobe is not used are selected. You may make it.

A long hole 17c is formed in the filter plate 17, and the long hole 17c has a convex portion 1 of the slide lever 18.
8a are engaged. The slide lever 18 is provided with a stopper 18b. A projection 18c is formed on the slide lever 18, and two ribs 7a and 7b of the flash switch lever 7 are engaged with the projection 18c. The strobe switch lever 7 and the slide lever 18 operate integrally in the direction of arrow A, and switch the aperture F number and switch the shutter speed as described later. Strobe switch lever 7 and slide lever 1
Reference numeral 8 denotes a strobe switching unit that switches the strobe between an operating state and a non-operating state.

Next, a mechanism for switching the amount of transmitted light will be described with reference to FIG. In the case of using a strobe, when the strobe switch lever 7 is slid rightward, the slide lever 18 operates in the same manner as shown in FIG.
The filter plate 17 is retracted due to the engagement between the a and the long hole 17c of the filter plate 17, and the exposure hole 16c of the lens receiver 16 is opened to form an open stop.

On the other hand, when the strobe is not used, when the strobe switch lever 7 is slid to the left, FIG.
As shown in (B), the slide lever 18 operates in the same manner, and the exposure hole 16c of the lens receiver 16 is covered by the filter plate 17 by the engagement of the convex portion 18a and the long hole 17c of the filter plate 17, so that the photographing lens The amount of transmitted light is
The filter is switched from c to the filter 17a, and the light amount for photographing is reduced. That is, the amount of transmitted light is reduced by the ND filter.

As described above, the transmission light amount switching means for switching the transmission light amount in conjunction with the switching of the flash switching means is provided, and the switching operation for switching the transmission light amount is performed in the same manner as the switching operation for ordinary flash photography. However, when the strobe is in an operation state for performing flash photography, the exposure hole 16 is used.
At c, the aperture becomes large, and when the flash is not operated in which flash photography is not performed, the aperture is reduced by the filter 17a.

The f-number of the aperture is substantially F6.7, which is the open F-number of the taking lens 4 when the flash is in operation, and F1 when the flash is not in operation.
Although it is set to 4, it is desirable to be F8 or less when the strobe is in operation, and F13 or more when the strobe is not in operation.

As described above, since the F-number of the taking lens becomes brighter than before, the balance between the main subject to which the strobe light reaches and the background to which the strobe light does not reach is improved.
Good quality photos. If the flash shooting distance range is the same as before, the ISO value of the film sensitivity is increased and the F-number of the shooting lens is brightened, so that the guide number of the flash can be reduced. The miniaturization can be achieved and the cost can be reduced. Further, when the strobe is not operated, that is, when photographing in the daytime, the F-number becomes larger, so that the depth of field becomes deeper and the range for sharp focus becomes wider.

Next, the shutter speed switching mechanism will be described with reference to FIG. As shown in FIG. 4A, the spacer 15 is provided with a stopper 15d and a guide notch 15e, and the slide notch 15e is provided by the guide notch 15e.
The stopper portion 18b serving as the shutter speed switching means 8 is movable. The sector 11 includes a stopper 15d of the spacer 15 and a stopper 1 of the slide lever 18.
8b.

In the operation state of the strobe shown in FIG. 4B, the strobe switch lever 7 is slid to the right to operate.
The stopper 18b of the slide lever 18 is moved rightward. When the release button 9 is pressed during photographing, the release mechanism 14 is operated, and when the sector lever 12 is rotated, the sector 11 closes the exposure window 15b and is in contact with the stopper portion 15d as shown in FIG. , The exposure window 15b is opened by rotating in the counterclockwise direction, and further rotated until it comes into contact with the stopper portion 18b of the slide lever 18. Thereafter, the sector 11 rotates clockwise by the urging force of the tension spring 13, closes the exposure window 15b again, comes into contact with the stopper 15d, and stops.

In the non-operation state of the strobe shown in FIG. 4 (C), the strobe switch lever 7 is slid to the left to operate.
The stopper 18b of the slide lever 18 is moved to the left. When the release button 9 is pressed during photographing, the sector 11 rotates counterclockwise to open the exposure window 15b and rotate until it contacts the stopper 18b of the slide lever 18 as described above. Thereafter, similarly, the sector 11 rotates clockwise and returns to the original position.

Here, in the strobe operation state shown in FIG. 4B, the sector 11 rotates and the operation range in which the sector 11 comes into contact with the stopper 15d of the spacer 15 is widened, and the reciprocating time becomes long. Speed slows down. Further, when the strobe is not operated as shown in FIG. 4 (C), the operation range in which the sector 11 rotates and comes into contact with the stopper portion 15d of the spacer 15 is narrowed, and the reciprocating time is shortened.
The shutter speed increases.

The shutter speed is set to 1/60 when the strobe is in operation and to 1/150 when the strobe is not in operation, but at least 1/100 or less in the strobe operation. A low speed is desirable.

As described above, by providing the shutter speed switching means for switching the shutter speed in conjunction with the switching of the flash switching means, the shutter speed becomes slower in the strobe operation state than in the prior art. The balance with the background where the strobe light does not reach is improved, resulting in a high quality photograph. Further, if the range of the flash shooting distance is the same as the conventional range, the ISO number of the film sensitivity becomes large, so that the guide number of the flash can be reduced. As a result, the downsizing can be achieved and the cost can be reduced. . Furthermore, when the strobe is not operated, that is, when photographing in the daytime, the shutter speed becomes higher, so that camera shake is reduced.

Further, operation of the strobe switch lever 7,
That is, the sliding of the slide lever 18 may perform both the switching of the F number of the aperture by the above-described aperture switching unit and the switching of the shutter speed by the shutter speed switching unit.

As a result, when the flash is in operation, F
If the number is F6.7 and the shutter speed is 1/60, the EV will be 8.5, and when the strobe is inactive,
F number: F14, shutter speed: 1/100, or F number: F10.5, shutter speed: 1/15
If it is set to 0, it becomes EV 11.5.

Finally, FIG. 5 shows another embodiment of the shutter speed switching mechanism.

An end 20a of a tension spring 20 for returning the sector is attached to a locking portion 12a of the sector lever 12 for operating the sector 11, and the other end 20b of the tension spring 20 is connected to the main body 10a. Boss part 1
It is hung on a boss 21a on one end of a lever 21 rotatable around 0f. Further, the boss 21b at the other end of the lever 21 is engaged with the U groove 18d of the slide lever 18 which operates integrally with the flash switch lever 7.

FIG. 5 shows a state in which the strobe switch lever 7 and the slide lever 18 are operated rightward, that is, a state in which the strobe switch is turned on. When this strobe is used, the lever 21 rotates counterclockwise, the operating length of the tension spring 20 is shortened, and the return force is weakened. In this state, the shutter speed is 1/60
About.

When the strobe switch is off, the slide lever 18 is at the position shown by the dashed line in the figure, and the lever 21 is rotated clockwise, so that the operation length of the extension spring 20 is increased.
That is, since the return force of the tension spring 20 is increased and the displacement of the spring is large, the shutter speed is faster than the strobe-on state of the strobe-on light, and is about 1/150.

As described above, the shutter speed can be switched with a simple configuration by switching the amount of change of the extension spring 20 for returning the exposure operation of the sector 11 by the shutter speed switching means.

Although an example in which the concept of the present invention is applied to a film unit with a lens has been described, this technique can be similarly applied to a camera, particularly an inexpensive camera. For example, even in a camera as shown in FIG. 6, by incorporating the same mechanism as the above-described lens-equipped film unit, balanced shooting can be performed. A photographing lens 31, a finder window 32, a strobe light emitting unit 33, and a strobe switch lever 34 are arranged on the front, and a release button 35, an exponent device window 36, a charge display window 37,
And a rewind handle 38, and a hoist knob 39 on the back. In this camera, manual film winding is used, but of course, electric film feeding may be used.

In general, in a lens shutter camera, photometry and distance measurement are performed by electronic control, and an optimum aperture value and focus are determined based on a calculation result. However, there is a problem that a product cost increases. On the other hand, a mechanism for reducing the amount of transmitted light when the strobe is not emitting light or increasing the shutter speed as in the present invention is inexpensive and has few failures, and is a technique that can be easily applied to a camera.

[0046]

According to the film unit with a built-in strobe of the present invention, any of the following effects can be obtained. In the strobe operation state, the balance between the main subject to which the strobe light reaches and the background to which the strobe light does not reach is improved, and a high-quality photograph is obtained. If the strobe shooting distance range is the same as the conventional one, the guide number of the strobe can be reduced, and as a result, the size of the strobe can be further reduced and the cost can be reduced. When the strobe is not operated, that is, when shooting in the daytime, the depth of field becomes deeper, and the range of sharp focus becomes wider. When the strobe is not operated, that is, when shooting in the daytime, camera shake is reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a film unit with a lens.

FIG. 2 is an exploded perspective view showing an internal mechanism of the film unit with a lens.

FIG. 3 is a front view of a filter plate and the like for switching the amount of transmitted light.

FIG. 4 is a front view of a sector or the like for switching a shutter speed.

FIG. 5 is a diagram of another embodiment for switching a shutter speed.

FIG. 6 is a perspective view of a camera.

[Explanation of symbols]

 Reference Signs List 1 Film unit with lens 4 Shooting lens 6 Strobe light emission window 7 Strobe switch lever 11 Sector 12 Sector lever 15d, 18b Stopper part 16c Exposure hole 17 Filter plate 17a Filter 18 Slide lever

Claims (11)

[Claims] 1. A strobe switching means for switching between an operation state and a non-operation state of a strobe in a film unit with a built-in strobe loaded with a film which has not been exposed beforehand, and a strobe operation state of the strobe switching means from a strobe operation state to a non-operation state. When the strobe is switched to the non-operating state, the transmitted light amount switching means converts the transmitted light amount to the photographing lens to F13 or more in F value conversion. Film unit with built-in strobe lens, characterized in that 2. The film unit with a built-in flash according to claim 1, wherein the transmitted light amount is F when the flash is operated.
2. The film unit with a built-in strobe lens according to claim 1, wherein the value is set to F8 or less in value conversion. 3. In a film unit with a built-in strobe which has been loaded with unexposed film in advance, a strobe switching means for switching between an operating state and a non-operating state of the strobe; And a shutter speed switching unit that switches a shutter speed to a low speed in response to switching from a strobe operation state to a non-operation state of the strobe switching unit. When the strobe is switched to the non-operation state, the transmitted light amount switching means reduces the transmitted light amount to the photographing lens to F13 or more in terms of F value, or sets the shutter speed to 1 or more.
/ Film unit with built-in flash, characterized in that it is set to 150 seconds or longer. 4. When the strobe is switched to an operating state, the amount of light transmitted to the photographing lens is switched to F8 or less in terms of F value, and the shutter speed is set to 1/100 second or less. 3. A film unit with a built-in strobe lens according to 3. 5. The film unit with a built-in strobe lens according to claim 1, wherein the transmitted light amount switching means is an ND filter. 6. The unexposed film has a sensitivity of ISO60.
The film unit with a built-in strobe lens according to claim 1, wherein the value is 0 or more. 7. In a camera having a built-in strobe, a strobe switching means for switching between an activated state and a non-operated state of the strobe, and a transmitted light amount interlocked with the switching of the strobe switched means from the strobe operated state to the non-operated state. A transmission light amount switching means for reducing the amount of transmitted light to the photographing lens when the strobe is switched to a non-operating state. Built-in camera. 8. The camera with a built-in strobe according to claim 7, wherein in the camera with the built-in strobe, the amount of transmitted light is set to F8 or less in terms of F value when the strobe is in an operating state. 9. A camera having a built-in strobe, a strobe switching means for switching between an operation state and a non-operation state of the strobe, and a transmission light amount interlocked with the switching of the strobe switching means from the strobe operation state to the non-operation state. When the strobe light is switched to a non-operational state, comprising: a transmission light amount switching means for decreasing the light amount; and a shutter speed switching means for switching a shutter speed to a low speed in conjunction with switching of the strobe switching means from a strobe operation state to a non-operational state. In this case, the transmitted light amount switching means reduces the transmitted light amount to the photographing lens to F13 or more in F value conversion, or sets the shutter speed to 1
A camera with a built-in strobe characterized by setting to / 150 seconds or more. 10. When the strobe is switched to the operating state, the amount of light transmitted to the photographing lens is switched to F8 or less in terms of F value, and the shutter speed is set to 1/100 second or less. A camera incorporating the strobe described in 9. 11. The camera according to claim 7, wherein the transmitted light amount switching unit is an ND filter.