JPS59111133A - Variable focus camera disabling flash photography in long-focal-length photography - Google Patents

Abstract

PURPOSE:To prevent a flash device from emitting light unnecessarily by preventing the flash device which provides almost no lighting effect in a long focal length state from being elevated for use when an optical photography system is set to long focal length. CONSTITUTION:A short and a long focal length state are shown in the figure. When the short focal length state is switched to the long focal length state, the sub lens 15 of an extender 14 moves off an optical path of photography to leave only a main lens 12 on the optical path of photograph and in said long focal length state, a lens barrel part 30 is moved to in front of a camera by the cover 32 of the lens barrel part 30. The extender 14 is energized to rotate clockwise when viewed from in front of the camera associatively with the forward movement of the lens barrel 30, and rotated counterclockwise by a cam following- up means to set the sub lens 15 on an optical axis of photography, setting the long focal length state by the main lens 12 and sub lens 15.

Description

Detailed Description of the Invention The present invention is capable of switching between short focal length photography using the main lens and long focal length photography in which the main lens is moved forward and a sub-lens is inserted behind it on the photographing optical axis. This invention relates to a so-called rear converter type variable focus camera incorporating a flash device.

Conventionally, variable focus cameras are capable of switching between short focal length photography using the main lens, and long focal length photography using the main lens moved forward and a secondary lens inserted behind it on the photographing optical axis.
U.S. Patent No. 3,388,650, Japanese Patent Application Publication No. 52-76919
No., Japanese Patent Application Publication No. 1983. -It is known as No. 33027, etc.
None of these cameras are designed to incorporate a flash device.

By the way, the present invention is such a variable focus camera (which incorporates a dedicated flash device and enables automatic flash photography), but in order to easily take snapshots, the main lens has an F3, F3, 5 or F 4
．． 5 (!: If you use a lens with a deep depth of focus like this, a long focal length lens with a secondary lens will become as dark as F8. Therefore, it is difficult to magnify distant objects in a bright place during the day. This is sufficient for taking pictures at night, but when taking pictures with a flash device and an amplifier in a room at night, the lens gets dark, and the
With such a built-in flash device, you can hardly expect any effect from the light emitted.

Therefore, the present invention makes the flash device, which has almost no luminous effect in the long focal length state, impossible to use when the photographic optical system is set to the long focal length, thereby making it unusable. It is an object of the present invention to provide a variable focus camera with a built-in flash device that prevents light emission.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of essential parts of an embodiment of a variable focus camera according to the present invention, and FIG. 2 is a schematic diagram for understanding the internal structure thereof. In the cross-sectional views, (a) shows a short focal length state, and (1) shows a long focal length state, and FIG. 3 is a front view of the main part of the interlocking system between the flash device and the lens barrel.

The support tube 11 holds the main lens 12 and has a bar 1 that is fitted and supported at two points on the constituent members of the lens barrel section 30 in parallel to the optical axis.
3 is fixed to the bar 13, and the bar 13 and the bar 13 are controlled to extend in a straight line by the rotation of a rotation distance link 23, which will be described later, at the focusing stop. On the rear side of the support tube 11, an extender 14 holding a secondary lens 15 with a holding ring 16 with a shack device in between is attached to the rear base plate 31, which is a component of the lens barrel section 30, and an extender shaft. It is mounted so as to be rotatable about 17, and is biased by a spring 18 so as to rotate toward the optical axis. Further, a support bar 19 is fixed to the rear base plate 31 on its negative side in parallel with the optical axis. The holding frame plate 1 and the rear holding frame plate 2 are slidably fitted and supported, and both the front and rear holding frame plates 1 and 2 (ζ are fitted with a guide bar 3 fixed at both ends. The rear base plate 31 is slidable between the front holding frame plate 1 and the rear holding frame plate 2 together with the support bar 19 using the guide bar 3 as a kite.

The rear holding frame plate 2 is positioned on the front holding frame plate 1 and the histogram 5
Furthermore, the front holding frame plate 1 is fixed to the front surface of the camera body 40 with screws 4, and the front part thereof forms a square cylindrical part 1a, forming a part of the external shape of the camera ζ.

In addition, a cover 32 that also serves as a moving operation member is fitted to the outer periphery of the cylindrical portion 1a of the front holding frame plate 1 at the frontmost portion of the lens barrel portion 30. The auxiliary bar 21 has one end fixed to the cover 32 and extends rearward parallel to the optical axis, passes through the rear base plate 31, and has the other end fitted and supported by the rear holding frame plate 2. has been done.

The auxiliary bar 21 operates to move the lens barrel 30 in order to change the focal length. It serves as an eyelid for the tilt L that allows the Y-bar 32 to move smoothly. Support bar 1 that supports between the lens barrel parts without external force
I'm trying not to let 9 know.

Furthermore, a bellows 7 whose end face is attached between the light-shielding frame plate 6 fixed to the opening side for film exposure of the camera body 40 and the rear base plate 31 of the lens barrel section 30 is attached to the rear holding frame. It is arranged inside the plate 2 and forms a part of the dark box section.

In the short focal length state shown in FIG. 2(a), only the main lens 12 is located on the photographing optical axis, and the sub lens 15 is either retracted from the photographing optical path or holding the lens barrel 30 with the cover 32. The extender 14 rotates in conjunction with the lens 1, and the sub lens 15 moves to the front of the camera.
The lens barrel section 3 is positioned at the rear photographing optical axis of
Pushing 0 backwards returns to the short focal length state shown in FIG. 2(a).

Next, the interlocking mechanism between the flash device and the lens barrel section will be explained.

On the right side of the camera body 40 when viewed from the front, there is a light emitter 41 to which a discharge tube and a reflector that constitute a flash device are attached, and a condenser 41 provided in front of the light emitter 41. A pin (not shown) protruding from the camera body 40 is fitted into the elongated hole 41a and supported so as to be slidable up and down.

A lifting spring 42 hung between the camera body 40 and the light emitting device 41 (!) constantly biases the light emitting device 41 in the direction of upward movement. In the position where the light emitter 41 is housed in the camera body 40 against the force, the hook 43a of the locking lever 43, which is pivoted on the camera body 40 and biased clockwise by the spring 44, engages the notch of the light emitter 41. It is engaged with and held by the portion 41b.

45 is a first gear for switching the flash mode, which is pivotally supported on the front of the camera body 40, and is connected to gears 45a and 45.
b, the gear 45a meshes with a rank 41C provided on the front edge of the light emitter 41, and the gear 45b meshes with a second gear 46. The second gear 46 meshes with a rank 47a provided at one end of an interlocking lever 47 supported on the front surface of the camera body 40 so as to be movable in the left-right direction, so that the vertical movement of the light emitter 41 is caused by the movement of the interlocking lever 47 in the left-right direction. Conversely, when the interlocking lever 47 is moved in the left-right direction, the light emitter 41 moves up and down.

On the other hand, the rear base plate 31 of the lens barrel section 30 is supported, and the front holding frame plate 1 and the rear holding frame plate 2 are rotatably supported in a space outside the <-19 fixing section, and are connected to the photographing optical axis. A parallel rotating lever 48 is provided, and the other end of the interlocking lever 47 contacts the outside of a bent portion 48d formed in a portion of the rear end of the rotating lever 48, so that one light emitting device 41. It can rotate under the force of a spring 42 via gears 45 and 46. Further, the rotary lever 48 is formed with a bent oblique cam 48a on the inside thereof, and can come into contact with the outer surface 31a of the support pallet 19 fixing portion of the rear base plate 31, so that the rear base plate 31 is pushed in. When the rear base plate 31 is pulled out, the base plate 48b of the diagonal cam 48a, which is on the non-cam shift side, receives the diagonal cam 48a. It is secured in the former state, but not in the latter state. Therefore, since the movement stroke of the interlocking lever 47 is controlled by the rotation lever 48, it is possible to raise the side of the light emitter 41 when the rear base plate 31 is pushed in, but when the rear base plate 31 is pulled out, Unable to ascend.

This is the same even if the rear base plate 31 is moved together with the lens barrel section 30 after the light emitter 41 has been raised. Diagonal cam 48 of rotating lever 48
When a is pressed and rotated counterclockwise and the interlocking lever 47 is pushed to the right, the light emitting device 41 is lowered and housed in the camera body 40.

Reference numeral 49 denotes a flash photography mode switching lever, which is slidably supported on the rear base plate 31 by means not shown, is biased toward the right in FIG. 48 is rotated clockwise to move to the left. However, the force of the spring 50 is sufficiently weaker than the force of the spring 42. Further, on the protrusion at the other end of the flash photography mode switching lever 49, a flash auto release lever <-51, which is rotatably attached to the main plate (not shown) at the front of the lens barrel 30, is attached to a spring 52. They are in contact with each other by a biasing force in a counterclockwise direction.
Therefore, when the flash photography mode switching lens 49 moves to the left, the flash auto release lever 51 rotates counterclockwise. However, the force of spring 52 is even weaker than the force of spring 50.

Reference numeral 53 denotes a flash auto blade stopper, which is composed of two levers 53a and 53b, and is rotatably supported on a shaft 53C on a shutter base plate (not shown) in the lens barrel section 30, and biased counterclockwise by a spring 54. One of the levers 53a is rotated clockwise and the shutter blade 2 is rotated clockwise.
At one end of the other lever 53b, a calculation lever 55 is pivotally supported at its center by a pin 53d, and is connected to the flash auto release lever. When the pin 51 rotates counterclockwise as described above, it can come into contact with the pin 53d.

The calculating lever 55 has one end 55a connected to a distance cam 23a of a rotational distance ring 23 rotatably supported by a support member (not shown) of the lens barrel 30 coaxially with the optical axis, and a pin 5 at the other end.
5b is connected to the ISO cam 56, and pin 53d is connected to the flash auto release lever 51 by the corresponding distance cam 23a.
The shack blade is moved along the contact surface of the shack blade and positioned, and the diaphragm of the shack blade can be obtained according to the film speed (ISO) and distance depending on the rotated position of the lever 53a of the flash-o-1 blade stopper 53. .

The ISO cam 56 is configured to be movable and adjustable by an ISO knob 57 slidably attached to the front surface of the cup 1-32 of the lens barrel section 30.

Next, the operation of this embodiment configured as above will be explained.

First, regarding the focal length switching operation of the photographing optical system, as described above, when switching from a short focal length state to a long focal length state, the sub lens 15 of the extender 14 shown in FIG. 2(a) is retracted from the photographing optical path. Then, in a short focal length state where only the main lens 12 is located on the photographing optical path, the lens barrel section 30 is moved to the front side of the camera using the cover 32 of the lens barrel section 30.

In conjunction with this forward movement of the lens barrel section 30, the extender 14
Since the lens is biased by the spring 18 to rotate counterclockwise when viewed from the front of the camera, the cam follower (not shown) rotates counterclockwise, and the secondary lens rotates as shown in FIG. 2 (1)). 15 is set on the photographing optical axis, the main lens 12 and the sub lens 15 are in a long focal length state.

In addition, when switching from a long focal length state to a short focal length state, the lens barrel section 30 is retracted rearward, and the sub lens 15 of the extender 14 is retracted from the photographing optical axis by an operation opposite to that described above. The state shown in FIG. 2(a) is reached.

Furthermore, regarding the operation during flash photography, when photographing using a flash device in a short focal length state where the lens barrel portion 3° and the rear base plate 31 are retracted, the locking lever 43
When the hook 43a is rotated counterclockwise against the force of the spring 44, the engagement between the hook 43a and the notch 41b of the light emitter 41 is released, the light emitter 41 is raised by the force of the spring 42, and the camera body 4
Protruding from 0.

This upward movement of the light emitter 41 is caused by the rack 41c1 first gear 4.
5 and the second gear 46, move the interlocking lever 47 to the left as shown in FIG. The flash auto mechanism including the flange 53 is set to the operating position to enable flash photography.

Furthermore, even if the locking lever 43 is operated in an attempt to take flash photography in a long focal length state where the rear base plate 31 is pulled out together with the lens barrel 30, the diagonal cam 48a of the rotary lever 48
The rear base plate 31 is attached to the high part of the cam shift which is the tip 48C.
Since the outer surface 31a of the lens is in contact with the rotary lever 48, the rotary lever 48 cannot be rotated, and therefore the light emitter 41 does not rise, making flash photography impossible.

On the other hand, when flash photography is possible with the light emitter 41 raised in the short focal length state, if the lens barrel section 30 is pulled out and switched to the long focal length state, the outer surface 31a of the rear base plate 31 may be The cam 48a is pushed and rotated counterclockwise as shown in the third figure, and the light emitting device 41 is flipped through the rack a1 of the interlocking lever 47, the second gear 46, and the first gear 45.
2, and is housed in the camera body 40, making flash photography impossible.

As explained above, the present invention allows or prevents the upper row of light emitters from rising so as to enable or disable single flash photography in response to switching of focal length by moving the lens barrel, and in particular, to prevent the upper row of light emitters from rising. If you add a secondary lens to the lens and the long focal length becomes dark, you will not be able to obtain the flash photography effect.
1. It has the effect of preventing flash photography and preventing the battery from quickly depleting due to accidental flash photography.

[Brief explanation of drawings]

The figures show an embodiment of the variable focus camera according to the present invention. Fig. 1 is an exploded perspective view of only the main parts, Fig. 2 is a schematic sectional view for understanding the camera configuration, and (a) is a schematic cross-sectional view for understanding the camera configuration. The short focal length state (I) is the long focal length state, and FIG. 3 is a front view of the main parts of the interlocking system between the flash device and the lens barrel. 1... Front holding frame plate, 2... Rear holding frame plate, 10...
Holding frame portion, 12...Main lens, 15...Secondary lens,
19... Support bar, 30... Tube barrel portion, 31... Rear base plate, 40... Camera body, 41... Light emitter, 42
...Rising lever, 48 - Rotating lever.

Claims (1)

[Claims] 1. Short focal length shooting with the main lens and with the main lens in front (
It has a movable lens barrel that can be switched to long focal length photography by moving this and inserting an auxiliary lens behind it onto the photography light @11,
and in a variable focus camera incorporating a flash device, a rotary lens is provided in the holding frame of the movable lens barrel to move the movable lens barrel (σ) (in conjunction with this, the rotation stroke is changed),
By changing the rotational strokes of the rotation and -, when using the flash device 1i'Iσ focal length photography, it is possible to perform flash photography with the flash device 1i'Iσ raised from the camera body, and the long focal length V
This variable focus camera is characterized in that it is configured so that when switching to large 11fi shooting, it is stored in the camera body and becomes unusable f5e.