JPS63163440A - Focal distance switching camera - Google Patents

Abstract

PURPOSE:To absorb force applied to a member for holding a front-element, and to prevent an immoderate force from being applied to a focal distance switching mechanism, by constituting the titled camera so that when a shock or weight is applied to the member for holding the front-element, an operated side member of an operating mechanism moves to a withdrawn position side against an energizing force of a spring. CONSTITUTION:Between an operating cam 14 being an operating side member of this operating mechanism and an operating lever 18 being an operated side member, a pair of pins 18b, 18c of the operating lever 18 corresponding to a pair of cam faces 14b, 14c of the operating cam 14 abut on as one-side hit, and the operating lever 18 is oscillated to a withdrawn position side thereby. Accordingly, in a telephoto photographing state, in case an external force is applied to a shutter block 4 for holding a main lens 4a, even in case this camera is placed by putting the shutter block 4 to the lower side, the oscillating lever 18 is oscillated in a state separated from the operating cam 14, therefore, an external force is absorbed by a spring, and it can be prevented that an immoderate force is applied to the operating mechanism. In such a way, a damage of a focal distance switching mechanism can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a focal length switchable camera that can perform standard photography and telephoto photography, or standard photography and wide-angle photography, for example. , a focal length switching mechanism that switches the focal length by sliding the front lens of the photographic optical system along the optical axis between a position where it protrudes from the camera body and a retracted position closer to the camera body. Regarding the camera.

[Conventional technology]

Conventionally, as the above-mentioned camera, one in which a focal length switching mechanism is constructed from a screw member extending in the optical axis direction and a plywood of a photographing optical system that is screwed into the screw member is known. In this device, the photographic optical system on the plywood can be moved in the optical axis direction by driving and rotating the screw member with a motor, etc., and the focal length can be switched and the focus can be adjusted at each focal length. (For example, Japanese Unexamined Patent Publication No. 1983
(Refer to Publication No.-122931).

[Problem that the invention seeks to solve]

However, the conventional configuration described above has the following problems.

In this type of focal length switching type camera, the amount of movement of the front lens for switching the focal length is relatively large;
A member that holds the front element when the front element is in the protruding position;
For example, the movable lens barrel is thick (protrudes from the camera body). Therefore, external shocks are easily applied to this large part that protrudes from the camera body, especially when the camera is placed with the front element facing down. , the entire weight of the camera body will be applied to this protruding part.

In the case of the conventional configuration described above, the focal length switching mechanism is composed of a screw member extending in the optical axis direction and a plywood for supporting the front lens that is screwed into this, and both are always linked. If an impact or external force is applied to the part of the camera body that protrudes greatly from the camera body when the front lens is in the protruding position, there is a risk that all of this will be applied directly to the focal length switching mechanism, causing damage to it. there were.

In view of the above circumstances, an object of the present invention is to prevent excessive force from being applied to the focal length switching mechanism due to impact, external force, etc. when the front lens is in the protruding position.

[Means for solving problems]

The characteristic configuration of the focal length switching type camera according to the present invention is that the front lens of the photographing optical system is slid along the optical axis between a position protruding from the camera body and a retracted position closer to the camera body. The focal length switching mechanism for switching the focal length is comprised of a spring that biases the front lens toward the protruding position, and an operating mechanism that slides the front lens toward the retracted position against the biasing force of the spring. The purpose of the present invention is to provide flexibility between the operating member and the operated member of the mechanism to allow the operated member to move toward the retracted position with respect to the operating member.

[For production]

In other words, when the front lens is in the protruding position, the weight of the camera body is applied to the member that holds the front lens due to an impact being applied to the member that holds the front lens, or when the camera is placed with the front lens facing down. Even if the front lens is caught, the operated side member of the operating mechanism that constitutes the focal length switching mechanism moves to the retracted position side with respect to the operating side member against the biasing force of the spring, and the member that holds the front lens is moved. Since the force applied to the lens is absorbed, it is possible to avoid applying excessive force to the focal length switching mechanism.

If the external force is removed, the operated member of the operating mechanism will return to its original position due to the biasing force of the spring, and the front lens of the photographic optical system will also return to its original position, and its focal length will be Return to original state.

〔Example〕

Hereinafter, the present invention will be described in detail based on the drawings.

The following embodiments will be described by taking as an example a bifocal switching camera, which is an example of a focal length switching camera that can selectively perform standard photography and telephoto photography. In addition, the present invention
It is also possible to apply the present invention to, for example, a triangular point switching camera that can switch the focal length in multiple stages.

FIG. 2 is a top view of a camera according to the invention.

(1) is a release button, and (2) is a focal length switching button as a switching operation tool for switching the focal length of a photographic optical system (PS), which will be described later.

Each time this focal length switching button (2) is pressed, the focal length of the photographing optical system (PS) changes to the standard (for example, 50m).
) (hereinafter, this state is referred to as the standard shooting state), and a state where the length is longer than the standard (for example, 70 cranes) (
(Hereinafter, this state will be referred to as the telephoto shooting state).
It is configured to switch sequentially.

In addition, instead of this focal length switching button (2), the 30th
As shown in the figure, a sliding focal length switching lever (2') may be provided as the switching operation tool. In this configuration, by setting the focal length switching lever (2゛) to the <position E) position, the telephoto shooting state is entered, and <5TND>
By setting the camera to the OFF position, the camera enters the standard shooting state, and by setting the camera to the OFF position, the power supply to each part of the camera is stopped.

The photographing optical system (PS) is housed in a camera body (3) and a fixed lens barrel (3A) connected to the camera body (3), and is connected from the tip of the fixed lens barrel (3Δ) to a shutter block (4), which will be described later. ) The tip of the main lens frame (4b) protrudes. As will be described in detail later, the main lens frame (4b) is located at the position shown by the broken line in the figure in the standard photographing state, and at the position shown by the chain double-dashed line in the figure in the telephoto photographing state.

FIG. 1 shows the overall configuration of the photographing optical system (PS) and the fungus optical system (FS).

In the figure, (4) is a shutter block, and the main lens (4a) is used for both the standard shooting state and the telephoto shooting state.
This main lens (4a) is the front element of the photographic optical system (PS)
A main lens frame (4b) that holds the lens and a shutter (not shown) are integrally assembled. This shutter block (4) has a pair of shafts (5X) fixed to the fixed base plate (5).

(5y) to be slidably supported in the direction of the optical axis (L), and is urged forward by a spring (6).

This shutter block (4) is supported by a support lever (7A) that is rotatable around an axis (L) parallel to the optical axis (L), and is inserted into the photographing optical path only in the telephoto shooting state. A secondary lens (7) is attached. Then, in a state covering this sub-lens (7), the lower half (5A) which is the cylindrical first mounting frame of the integrally molded fixed base plate (5) is attached.
A movable lens barrel (8) that is slidable by being fitted inside the shutter block (4) is fixed to the shutter block (4), is slidable in the direction of the optical axis (L), and is biased forward by a spring (6). has been done.

As shown in FIGS. 3(a) and (+1) and FIG. It is biased towards the side where it is inserted. A gear portion (7a) is formed on the outer peripheral surface of the shaft core portion of the support lever (78).

A gear part (10a) that engages with this gear part (7a)
) is provided with a fan-shaped operating member (11) that rotates integrally around the same axis (X2) as the gear member (10).

As shown in FIGS. 5 and 6, this operating member (11)
has an oval-shaped shaft core (lla) in cross section, and this shaft core (lla) is inserted into the round hole (10b) of the gear member (10).
The intermediate member (12) is inserted into the oval hole (12a) of the intermediate member (12) so as to be relatively unrotatable. Then, as shown in FIGS. 5 and 7, this intermediate member (
12) and the arm (12b) of the gear member (10).
0b) are stacked on top of each other, and a coil spring (13) with both ends bent is provided so as to sandwich them together.

As shown in FIG. 4, when the operating member (11) is rotated clockwise, the intermediate member (12) and the intermediate member (
The gear member 10), which is spring-coupled to 12), is in a rotated position in the same direction. The gear part (10a) of the gear member (10) and the gear part (7a) of the support lever (7A)
The support lever (7A) is rotated counterclockwise against the biasing force of the spring (9), and the sub lens (7) is retracted from the photographing optical path.

At this time, the operating member (11), which is the operating member, is spring-coupled to the gear member (10), which is the operated member, which is gear-coupled to the support lever (7A) of the sub-lens (7). Therefore, it is relatively rotatable, and the secondary lens (7)
Even after the holder (7B) comes into contact with the upper frame (8a) of the movable lens barrel (8), the movement toward retiring the sub-lens (7) is allowed, so the sub-lens (7) The amount of operation of the operation member (11) can be set to a large value while minimizing the space for retiring from the photographing optical path, and it is possible to prevent manufacturing errors in the parts that make up the mechanism for moving the sub-lens (7) in and out. Regardless of installation errors, the sub-lens (7) can always be reliably retired from the photographing optical path.

As shown in FIGS. 5 and 10, this operating member (11
) faces the outside from the upper surface of the movable lens barrel (8). As shown in FIGS. 8 and 10, as the shutter block (4) moves in the direction of the optical axis (1,), it comes into contact with the operating protrusion (llb) of the operating member (11). A cam surface (5a) for retracting the sub-lens (7) from the photographing optical path is integrally provided inside the fixed base plate (5).

In standard shooting conditions, Fig. 3 (a) and Fig. 9 (a)
, and, as shown in FIG. 10, the cam surface (5a) of the base plate (5) fixed to the operation protrusion (llb) of the operation member (11)
The flat part (5X) of is in contact with it. At this time, the operating member (11) is held in a position in which it has rotated most clockwise around the axis (X2), and the sub lens (7) is retracted from the photographing optical path against the biasing force of the spring (9). It is located in the same position.

The flat portion (5X) of the cam surface (5a) is parallel to the optical axis (L) and has a certain length. That is, in the standard photographing state, when moving the movable lens barrel (8) back and forth in the optical axis (L) direction together with the shutter block (4) in order to perform a focus adjustment operation as described later, the sub lens (7
) is configured to remain retired from the imaging optical path.

The cam surface (5a) is connected to the optical axis (L) following the flat part (5X).
) has a curved portion (5y) that is curved away from the curved portion (5y). By moving both the shutter block (4) and the movable lens barrel (8) forward along the optical axis (L) from the standard photographing state described above, the spring (9)
), the operation is rotated in the counterclockwise direction in conjunction with the support lever (7A) that is rotated in the clockwise direction in FIGS. 3(A) and (II) and in FIG. 4. As shown in FIG. 9 (TI), the operating protrusion (llb) of the member (11) comes out of contact with the flat part (5X) of the cam surface (5a) and comes into contact with the curved part (5y). Let's touch each other.

become.

As a result, the support lever (7A) is rotated clockwise by the biasing force of the spring (9), the sub lens (7) is inserted into the photographing optical path, and the bottle (4b) installed in the shutter block (4) is rotated clockwise. ) and is positioned by abutting on it. As a result, a telephoto shooting state appears. This state is shown in Figure 3 (υ
) and FIG. 9(c).

At this time, the operating protrusion (llb) of the operating member (11) separates from the cam surface (5a) of the fixed base plate (5), and from then on,
Even if the shutter block (4) and movable lens barrel (8) are moved back and forth in the direction of the optical axis (L) to perform a focus adjustment operation as described later, they do not come into contact with the cam surface (5a). That is, in the telephoto shooting state, the sub lens (7) is maintained inserted in the shooting optical path.

That is, the support lever (7A) of the sub-lens (7), the spring (9), the pin (4b) of the shutter block (4),
Gear member (10), intermediate member (12), operating member (11)
), the coil spring (13), the upper frame (8a) of the movable lens barrel (8), and the cam surface (5a) of the fixed base plate (5) to move the secondary lens (7) into the protruding position and the retracted position. It constitutes an egress/egress means for changing and fixing the position.

Returning to FIG. 1 and continuing the explanation, a motor (M) is built into the side of the fixed base plate (5).

Furthermore, a gear base plate (23) is provided further below the lower half (5A) of the fixed base plate (5), and is screwed to the fixed base plate (5).

On this gear base plate (23), there is a feeding cam (14) rotatable around the axis (x5), and a rotational driving force is transmitted from the motor (M) to this rotary feeding cam (14). The gear train (15), the ratchet part (
A stop lever (16) having a claw (16a) that engages with the stop lever (14a), a magnetic screw (17) that controls the operation of the stop lever (16), and the feeding cam (14).
) is equipped with a drive mechanism for the photographing optical system (PS) consisting of a feeding lever (18) which is a cam follower on the photographing optical system (PS) side for the photographing optical system (PS).

The stop lever (16) is rotatably mounted around the axis (X3), and the stop lever (16) is rotated counterclockwise in FIG.
16a) is the ratchet part (14a) of the feeding cam (14)
A spring (19) is provided which biases the spring in the direction of engagement. Further, an iron piece (20) that is attracted to the magnet (17) is attached to the end of the stop lever (16) opposite to the claw (16a) with respect to the mounting axis (x3). There is.

Then, activate this magnet (17) to
0), the stop lever (16) claw (
16a) and the ratchet part (14a) of the feeding cam (14)
By disabling engagement with the feed cam (14) and allowing rotation of the feed cam (14), on the other hand, by stopping the operation of the magnet (17), the stop lever (1
6) in a counterclockwise direction to engage the pawl (16a) with the ratchet portion (14a) of the feed-out cam (14), thereby prohibiting rotation of the feed-out cam (14). It is.

As shown in FIG. 11, the feed lever (18) also has a first shaft on its lower surface that is pivotally supported by the pivot portion (21a) of the support lever (21) attached to the gear base plate (23).
In addition to the pin (18a), there are two pins (hereinafter referred to as the second pin and the third pin, respectively) (18b) and (18c).
has been planted. In addition, this feeding lever (1
A fourth pin (18d) is implanted on the upper surface of the free end side of B).

The second bottle (18b) and the third pin (18c) are a pair of cam surfaces (hereinafter referred to as a first cam surface and a second cam surface) formed on the inner circumference of the feeding cam (14), respectively. (14b)
, (14c), respectively. Further, the fourth pin (18d) is connected to a long hole (not shown in Fig. 2) (8a) extending in a direction perpendicular to the optical axis (L) formed on the lower surface of the movable lens barrel (8). It matches.

In other words, this feeding lever (18) is
8b) or the third pin (18C) is the feeding cam (14)
The fourth cam surface engages with the movable lens barrel (8), which is the holding frame of the photographic optical system (PS), by contacting the pair of cam surfaces (14b) and (14c) and maintaining a predetermined posture. pin(
18d) is configured to position the shutter block (4) by regulating the movement of the shutter block (4) which is urged forward by the spring (6). Its operation will be described later.

As explained earlier, in the telephoto shooting state, the main lens frame (4b) that holds the main lens (4a), which is the front lens of the photographic optical system (PS) attached to the shutter block (4), As shown by the two-dot chain line in FIG. 2, the shutter block (4) is in a protruding position protruding from the camera body (3).
The positioning of the main lens (4a) is done by a spring (6) that urges the shutter block (4) forward together with the main lens (4a), and a spring (6) that urges the shutter block (4) forward together with the main lens (4a).
This is done by a mechanism that slides the motor (M), a gear train (15), a feeding cam (14), and a feeding lever (18) to the retirement position.

The feeding cam (1
4) and the feeding lever (18), which is the operated member, as shown in FIG. ), the pair of pins (18b) and (18c) are allowed to swing toward the retracted position by one-sidedly abutting the pair of pins (18b) and (18c). Shutter block (4a) holding the shutter block (4a)
), even if this camera is placed with the shutter block (4) facing down, the swing lever (18) will move away from the feeding cam (14). Since it swings, external force is absorbed by the spring (6), preventing excessive force from being applied to the operating mechanism, and reducing damage to the operating mechanism.

Although it will be explained in detail later when explaining the operation, the above-mentioned motor (M
), the feeding cam (14) is rotated in the predetermined forward and reverse directions, and by changing the posture of the feeding lever (18) accordingly, the shutter block (
In the positioning step 4), the main lens (4a) is moved along the optical axis (L) direction, and the sub lens (7) is moved in and out of the photographing optical path.

Then, by driving this motor (M), the focal length is switched between the standard shooting state and the telephoto shooting state, and furthermore, in each of these two shooting states, the same motor (
The main lens (4a) is moved by driving the main lens (4a) to perform a focus adjustment operation.

That is, gear train (15), feeding cam (14), feeding lever (1B), stop lever (16), magnet (1
7), the photographing optical system (p), and the motor (M).
The operating means is configured to sequentially perform the switching of the focal length and the focus adjustment at each focal length in a series of operations (s).

At this time, the shutter block (4) is urged forward and its position is determined by a pair of pins (18b) and (18c) that abut against a pair of cam surfaces (14b) and (14c) of the feeding cam (14). A feeding lever (1
8), while rotating the feeding cam (14) at a constant speed, the rotation trajectory of the feeding cam (14) is rotated in the tangential direction,
That is, the inclination angle of the cam surfaces (14b) and (14c) with respect to the operating direction of the cam (14) is determined by determining the required moving speed of the shutter block (4) (for example, when the focus is adjusted in the telephoto shooting state, the angle of inclination of the cam surfaces (14b) and (14c) is Because it can be formed to match the relative movement speed (such as faster than the focus adjustment operation of the state, or faster than the focal length switching operation than the focus adjustment operation), it is possible to The focal length switching operation can be performed quickly and the focus adjustment operation can be performed with high precision.

The first cam surface (14b) of the feeding cam (14) and the second pin (18b) of the operating lever (18) that is in contact with the first cam surface (14b) are used to adjust the focus of the photographing optical system (PS) in the standard photographing state, and to
The camera is configured to perform the first half of switching the focal length from the standard shooting state to the telephoto shooting state.

Also, the second cam surface (14c) of the feeding cam (14) and the third bin (18c) of the operating lever (18) that comes into contact with the second cam surface (14c)
is configured to perform the latter half of switching the focal length of the photographic optical system (PS) from the standard photographing state to the telephoto photographing state, and to adjust the focus in the telephoto photographing state.

That is, on the first cam surface (14b) of the feeding cam (14),
One end of the short focal length side focus adjustment cam surface (14X) and the focal length switching cam surface (14Y) is also connected to the second cam surface (
14c) is formed with the other end of the focal length switching cam surface (14Y) and a long focal length side focus adjustment cam surface (14Z).

Then, these short focal length side focus adjustment cam surfaces (14X
), the focal length switching cam surface (14Y), and the long focal length side focus adjustment cam surface (14Z), in that order, the rotation direction of the rotary feeding cam (14), that is, the cam surface (14Z) of this cam (14). They are formed side by side in the operating direction.

By dividing the cam surface into the first cam surface (14b) and the second cam surface (14c) in this way, it is possible to reduce the operating error of the delivery lever (18), which is the cam follower.

That is, if the cam surface is a series, one end of the cam surface will be formed near the rotation axis (x5) of the feeding cam (14). In that case, the length of the cam surface in the circumferential direction for a given rotation angle of the delivery cam (14) becomes relatively short.

Then, the rotation axis (x5) of this feeding cam (14)
A cam surface formed nearby has a larger circumferential error for the same rotational angle error than a cam surface formed near the outer peripheral surface of the feeding cam (14), and the feeding lever (18), which is a cam follower, has a larger error in the circumferential direction than a cam surface formed near the outer peripheral surface of the feeding cam (14). ) operation error increases.

On the other hand, by dividing the cam surface and changing the cam surface during operation as described above, the cam surface can be formed only near the outer peripheral surface of the feeding cam (14), and operational errors can also be reduced. It can be made smaller.

Furthermore, the first cam surface (14b) and the second cam surface (1'4c), which are the divided circumferential surfaces of the rotary feeding cam (14), are defined by the depth from the top surface of the feeding cam (14), i.e. , feeding cam (
14) in the rotation axis (X5) direction. Correspondingly, the pair of divided peripheral surfaces (14b) provided on the feeding lever (18) which is a cam follower
), (14c), a pair of pins (18b) and (18c), which are cam followers, respectively, are attached to the plywood (18c) of the operating lever (18), as shown in FIGS.
The amount of protrusion from 18Δ) is different.

In other words, in this way, the cam surfaces (14b) and (14c) of the rotary feeding cam (14) are divided, and the feeding cam (14) is divided into two parts.
14) is displaced in the rotation axis (X5) direction, these cam surfaces (14b), (
14c), both of the cam surfaces (14b) for controlling the movement of the shutter block (4) can be configured to have a large displacement range in the radial direction of the feeding cam (14). (14c),
Compared to the amount of linear movement of the shutter block (4), the rotation angle of the feeding cam (14) relative to the rotational axis (X5) can be made larger, and operational errors can be reduced.

Furthermore, a pair of cam surfaces (14b) of the feeding cam (14).

(14C), its focusing cam surface (14X)
.

(14z), as shown in FIG. 13, each has several cylindrical surfaces (m) at different distances from the rotation center ( ) are connected by an inclined surface (n) extending between them.

This inclined surface (n) is an operating region in which focus adjustment is performed by operating an operating lever (18) that is a cam follower, and the cylindrical surface (m) is a non-operating region. Note that the fourth pin (18d) of the operating lever (18) serves as a focus adjustment member of the photographic optical system (PS).

Next, the cylindrical surface (m) and inclined surface (n) of the focusing cam surfaces (14X) and (14Z) will be explained.

When these pair of cam surfaces (14b) and (14c) are developed linearly, they become as shown in FIG. 14.

Note that the drawing shows a developed view of only the first cam surface (14b), and the following description will be made accordingly.

That is, some cylindrical surfaces (m) correspond to straight line parts (') extending in the left-right direction in the figure, and inclined surfaces (n) that connect these several cylindrical surfaces (m) to each other correspond to straight line parts. (m
”) corresponds to the sloped portion (n゛) extending between the two.

As shown in FIG. 14, the second pin (18b) of the feeding lever (18) corresponding to this first cam surface (14b) is located either in the longitudinal direction of the straight portion (mo). (Actually, any part in the circumferential direction of the cylindrical surface (m)).

No matter where the second pin (18b) of the feeding lever (18) is in the position shown by the solid line, one-dot chain line, or two-dot chain line in FIG. 14, the posture of the feeding lever (18) remains unchanged and the shutter block ( 4) and the optical axis (L) of the movable lens barrel (8)
The directional position remains unchanged. That is, the shutter block (
4) and when positioning the movable lens barrel (8) in the optical axis (L) direction, there is an allowance in the circumferential direction at the rotation stop position of the feeding cam (14). This has the following meaning.

In other words, during the focus adjustment operation, the shutter block (
4) When stopping the movement in the optical axis (L) direction, the drive of the motor (M) is stopped to stop the rotation of the feeding cam (14), and the operation of the magnet (F) is stopped to move the stop lever. The pawl (16a) of (16) is configured to engage with the ratchet portion (14a) of the feeding cam (14).

At this time, if the battery that is the power source is new and the power supply voltage is high enough, the motor (M) will have sufficient driving force, so
After the motor (M) stops, the feeding cam (14) is rotated by a predetermined amount, and the pawl (16a) of the stop lever (16) fully enters the ratchet portion (14a) of the feeding cam (14).

Then, the second pin (18b) of the feeding lever (18)
The feeding cam (14) is positioned so as to come into contact with the first cam surface (14b) of the feeding cam (14) at the position shown by the solid line in FIG.

On the other hand, when the battery gets old and the power supply voltage decreases, the driving force of the motor (M) becomes insufficient and the motor (
M) A situation may occur in which the amount of rotation of the feeding cam (14) after stopping is less than a predetermined amount.

In this case, the claw (16a) of the stop lever (16)
The feeding cam (14) will be positioned without fully entering the ratchet portion (14a) of the feeding cam (14). Then, the second pin (18b) of the feeding lever (18) comes into contact with the first cam surface (14b) of the feeding cam (14) at a position shown by a dashed line or a chain double dotted line in FIG.

As mentioned above, the operation lever (1st) in Fig. 14
As long as the second pin (18b) of the shutter block (4) and the optical axis (L
) direction position remains unchanged. Therefore, as mentioned above,
Even if there are slight variations in the stop position of the feeding cam (14) due to fluctuations in the power supply voltage, etc., the main lens (4a) is always positioned stably.

Although not shown, the third bin (48c) of the feeding lever (1st) and the second cam surface (14c) of the feeding cam (14)
The structure is similar between the two.

On the other hand, the support lever (21) is a support member that rotatably supports the feeding lever (18) by pivoting the first pin (18a) of the feeding lever (18) to the pivot portion (21a).
As shown in Figs. 1 and 15, the gear base plate (23
), and fit it onto the bottle (23i) installed in the shaft (x6).
It is attached so that it can rotate freely.

A long hole (21b) is formed in the support lever (21) on the opposite side of the pivot portion (21a) across the rotation axis (x6), and on the other hand, this long hole (21b) is formed in the gear base plate (23). Long hole (2
A hole (23j) having a diameter equal to or larger than the minor axis of the elongated hole (21b) is formed at a position corresponding to 1b).

The support lever (21) can be fitted into the elongated hole (21b) of the support lever (21) at the tip of the first cylindrical shaft having the same outer diameter as the inner diameter of the hole (23j) of the gear base plate (23). A jig (not shown) with an eccentric second cylindrical shaft having an outer diameter of
Rotate around the axis (x6) by passing it through the hole (23j) of the gear base plate (23) from below and inserting only the second cylindrical shaft into the long hole (21b) and rotating it. is configured to do so.

In addition, (22) in the figure is a fixing screw, the threaded portion of which passes through another elongated hole (21c) formed in the support lever (21) and is screwed into the gear base plate (23).

That is, the support lever (21) is rotatably attached around the axis (X6), and the elongated hole (21) for position change operation is attached.
b) and the fixing screw (22), the support lever (
21) is configured as an adjusting means for changing the position.

When the support lever (21) rotates around the axis (X6), the position of its pivot portion (21a) also moves.

For example, when the support lever (21) is rotated counterclockwise from the state shown by the solid line in FIG. 15, the pivot portion (21a) moves downward in the figure, as shown by the two-dot chain line in FIG. .

At this time, the feed lever (18) is moved to the fourth bin (18).
d) engages with the movable lens barrel (8) and its second pin (18b
) is positioned by coming into contact with the first cam surface (14b) of the feeding cam (14), so this second pin (18
Rotate counterclockwise using b) as a fulcrum.

Therefore, as shown by the two-dot chain line in FIG. 15, the fourth pin (18d) of the feeding lever (18) moves upward in the figure.

As a result, the shutter block (4) and the movable lens barrel (8), which are biased forward in the optical axis (L) direction, move forward, changing the position of the main lens (4a).

In FIG. 15, the first pin (
18b) is the first cam surface (14b) of the feeding cam (14)
It is located at the starting end (14s) of This position will be described later, but in the standard shooting condition, the shooting optical system (PS) (
This case corresponds to a state in which the main lens (4a) is focused at an infinity position. At this time, if there is no error,
The lens block (4) and the movable lens barrel (8) are located at the rearmost edge of their movement range.

As described above, by rotating the support lever (21) and changing the position of the main lens (4a), the main lens (4a)
Regardless of errors caused by manufacturing errors or assembly errors, the first pin (18b) of the feeding lever (18)
) The position of the photographing optical system (PS) can be finely adjusted so that the photographing optical system (PS) focuses at an infinite position while being located at the starting end (14s) of the first cam surface (14b) of It is structured as follows.

The elongated hole (21b) for position change operation, which is an adjustment section constituting the adjustment means, faces the outside of the aforementioned operation means. Therefore, the above-mentioned fine adjustment of the position of the photographic optical system (PS) can be easily performed even after the operation means is assembled.

In addition, in FIG. 15, the first feed lever (18)
The pin (18b) is connected to the first cam surface (14) of the feeding cam (14).
b) shows the fine adjustment of the photographing optical system (PS) accompanying the rotation of the support lever (21) in a state in which it is in contact with the feed-out cam (14). )
Fine adjustment may be made while the second cam surface (14c) is in contact with the terminal end of the second cam surface (14c). This position corresponds to the state in which the photographing optical system (PS) (in this case, the main lens (4a) and the sub-lens (7)) is focused on the closest position in the telephoto shooting state, and if there is no error, The shutter block (4) and the movable lens barrel (8) are located at the frontmost edge of their movement range.

On the other hand, on the lower surface of the feeding cam (14), as shown in FIG. ) (148), (14B).

(14C) is provided. Also, this feeding cam (1
As shown in FIG. 17, on the top surface of the gear base plate (23), which is the fixed part on which the gear cam 4) is mounted, there are three position detection brushes (14A) and (14B) for the feeding cam (14).
.

(14C) to electrically open and close position detection switches (S3) to (S5), which will be described later, which constitute a sensor for detecting the cam position, in accordance with the rotational position of the feeding cam (14). A detection pattern is formed.

This position detection pattern is based on the center of rotation of the feeding cam (×5
) with five almost concentric circular arc terminals (23A
) to (23E).

The innermost circular arc terminal (23A) and the fourth circular arc end from the innermost circumference: i-(23D), together with the second brush (14B), are used for photographing in two photographing states: standard photographing state and telephoto photographing state. It constitutes a lens initial state detection switch (S3) for detecting the initial state of the optical system (PS) (in this embodiment, the state of focusing on an infinite position). and a non-conducting portion (23x) where one end of the second brush (14B) is detached from the arcuate terminal (23D) when the photographing optical system (PS) is in the initial state.

(23y), and the lens initial state detection switch (S
3) is configured to be closed.

Also, the third arc terminal from the innermost circumference (23C) and the fourth and fifth arc terminals from the innermost circumference (23D).

The protruding part (23E), together with the third brush (14C), is a lens position detection switch (S4) for detecting the amount of movement of the shutter block (4) in two shooting states, the standard shooting state and the telephoto shooting state. It consists of This lens position detection switch (S4) repeatedly opens and closes in response to the rotation of the feeding cam (14) for moving the shutter block (4) and outputs a pulse signal.

A control device (24), which will be described later, is configured to be able to count this pulse signal and detect the position of the shank block (4).

Furthermore, the second arc terminal (23B) from the innermost circumference and the arc terminal (23, E) from the outermost circumference are the first brush (14A).
In addition, a lens area detection switch (s5) is configured to detect whether the photographing optical system (PS) is in a standard photographing state or a telephoto photographing state. When the photographing optical system (PS) is in the telephoto shooting state, that is, when the shutter block (4) is on the optical axis (
L) Non-conducting part (23z) located on the front side and where one end of the first brush (14A) comes off from the arc terminal (23B) when the sub lens (7) is inserted into the photographing optical path.
The lens area detection switch (S5) is closed.

As shown in FIG. 18, this gear base plate (23)
On the bottom surface of the arc terminals (23A) to (23
A group of connection terminals (23a) to (23e) connected to E) via through holes respectively face the outside from the gear base plate (23).

As shown in FIG. 19, the control device (24) includes, in addition to the three switches (S3) to (S5) described above, a release switch (Sl) that opens and closes in conjunction with the operation of the release button (1). A lens changeover switch (S2) is connected to the camera, which is opened and closed in conjunction with the operation of a focal length changeover lever (2) for selecting between a standard shooting state and a telephoto shooting state.

The control device (24) also includes a shutter block (4).
) and the movable lens barrel (8) in the optical axis (L) direction, and a stop lever (16) that prohibits and allows rotation of the feeding cam (14). A magnet (17) is connected. Then, the motor (M) and magnet (17) are connected to each other according to the states of the above-mentioned switches (Sl) to (S5).
The control signal is configured to be output.

Next, this control, and the accompanying focal length switching operation and focus adjustment operation, will be explained with reference to FIGS.

(1) Focus adjustment operation in standard shooting condition The state shown in Figure 20 (a) is the initial state of standard shooting condition, that is, the shooting optical system (PS) (consisting only of the main lens (4a)) is at infinity. The camera is focused on a far position. At this time, the shutter block (4) is attached to the main lens frame (4b
) is stopped at the position shown by the broken line in Figure 2,
The main lens (4a), which is the front lens incorporated in this shutter block (4), is also in the retracted position.

In this state, the pawl (16a) of the stop lever (16) is connected to the ratchet portion (14a) on the outer peripheral surface of the feeding cam (14).
It is in contact with other parts. In addition, the iron piece (20) is
It is in contact with the magnet (17).

Then, the second pin (18b) of the feeding lever (18) is connected to the starting end (14) of the first cam surface (14b) of the feeding cam (14).
The shutter block (4) is in contact with the shutter block (4), which is urged forward in the optical axis (L) direction (upward in the figure).
is positioned. Further, the third pin (18c) of the feeding lever (18) is connected to the second cam surface (
14c).

At this time, only the lens initial state detection switch (S3) is closed, and the other switches (Sl) and (S2) are closed.
, (S3), (S4), and (35) remain open (see #0 in FIG. 21; hereinafter, only the stamp numbers will be described).

Release button (Sl) by operating the release button (1)
When is closed (11), the magnet (17) is activated to attract the iron piece (20) #2, and the motor (M) starts rotating counterclockwise in Fig. 20 (A).
3〉. Then, the feeding cam (14) is passed through the gear train (15).
) begins to rotate clockwise in the figure, and the lens initial state detection switch (S3) is released.

As the feeding cam (14) rotates, the feeding lever (18)
The second pin (18b) moves along the first cam surface (14b) of the feeding cam (14), and the feeding lever (18) rotates counterclockwise around the axis (X4). As a result, the shutter block (4) is moved forward in the optical axis (L) direction by the urging force of the spring (6).

According to the rotation of the steering cam (14), the lens position detection switch (S4) is repeatedly opened and closed (#5, 6>), and when the photographic optical system (PS) reaches the in-focus position, the motor (M
) rotation is stopped or #7>. Photography optical system (PS
) has reached the in-focus position #6> is determined by the lens position detection switch (S4) in the control device (24).
This is done by counting the pulse signals output by opening and closing ) and comparing the count value with a separately determined focus count value.

After short-circuiting both ends of the motor (M) to stop its rotation <i17>, the power to the magnet (17) is cut off <#8>. As a result, the stop lever (16)
Due to the biasing force of the spring (19), the claw (16a) rotates counterclockwise around the axis (x3) as shown in FIG. (14
a) to position the feeding cam (14).

Next, start a timer (not shown) <#9)
. After that, the shutter (not shown) is opened and closed.
#10>, wait for timer time up<#11
>. This timer is set to time out after a period slightly longer than the longest shutter speed.

That is, in step (#11>), the end of the opening/closing operation of the shutter is waited.

When the opening/closing operation of the shutter is completed, the motor (M) starts rotating clockwise in FIG. 20 (rl).
112>. Then, the feeding cam (
14) starts rotating counterclockwise in the figure. Correspondingly, the feeding lever (18) rotates clockwise, and the shutter block (4) and the movable lens barrel (8) are drawn to the rear side in the direction of the optical axis (L).

When the feeding cam (14) reaches the initial position, the lens initial state detection switch (s3) is closed <#13).

Thereafter, both ends of the motor (M) are short-circuited to stop its rotation <114>, and the power to the magnet (17) is cut off (#15>).

As a result, the initial state shown in FIG. 20(a) is restored (#16>).

(2) Focal length switching operation Switching of the photographing state between the two focal lengths is performed by operating the focal length switching button (2). Each will be explained separately below.

i) Switching from the standard shooting state to the telephoto shooting state The initial state of the standard shooting state shown in FIG.
(See #100 in the figure, below, only step numbers are written)
, when the lens changeover switch (S2) is closed in conjunction with the pressing of the focal length changeover button (2), <4110
1>, then check the state of the lens area detection switch (S5) (#102>. In the standard shooting condition, this lens area detection switch (S5) is open, so <#110 > Proceed to step >.

First, the motor (M) rotates counterclockwise in FIG. 20 (A), #110>, and the magneto (17) is activated to attract the iron piece (20) (#111>).

The feeding cam (14) starts rotating clockwise in conjunction with the rotation of the motor (M), and the lens initial state detection switch (S
3) is released (#112>).

As the feeding cam (14) rotates clockwise, the feeding lever causes the second pin (18b) to come into contact with its first cam surface (14b), as in the case of the focus adjustment operation in the standard shooting condition. (18) is rotated counterclockwise. As a result, the shutter block (4) and the movable lens barrel (8) are extended forward in the direction of the optical axis (L).

The first cam surface (14b) of the feeding cam (14) extends around the entire circumference, and as shown in FIG. 20 (c), the feeding lever (18) rotates and its second pin (18b) When it exceeds the terminal end (14t) of the first cam surface (14b), it no longer contacts the second pin (18b). Therefore, the feeding lever (18) is allowed to further rotate counterclockwise by being pulled by the shutter block (4) which is biased forward in the optical axis (L) direction.

At this time, the third pin (18c) of the feeding lever (18) is in contact with the second cam surface (14c) of the feeding cam (14), and thereafter, as the feeding cam (14) rotates clockwise. The lever 18 is fed out along the second cam surface (14c).
), the rotation of the delivery lever (18) is controlled by the movement of the third pin (18c).

When the lens area detection switch (S5) is closed by rotating the feeding cam (14) to a position corresponding to the telephoto shooting area of the photographic optical system (PS), the magnet (17) Cut off the power to (#114>), and the feed-out cam (14
) can be engaged with the ratchet portion (14a).

Furthermore, if the lens initial state detection switch (S3) is closed (#115>, the motor (M)
Short both ends of and stop its rotation (#11
6>, this state is the initial state of the telephoto shooting state shown in FIG. 20 (d) (#130>.

At this time, the shutter block (4) is in the position shown by the two-dot chain line in FIG. in position.

As already explained, with this switching, the secondary lens (
7) is inserted into the photographing optical path.

ii) Switching from telephoto shooting state to standard shooting state Initial state of telephoto shooting state shown in FIG. 20 (d) <110
Similarly, when the lens changeover switch (S2) is closed at <1101> at <0>, it is in the telephoto shooting state and the lens area detection switch (S5) is closed.
Based on the determination made in step #102, the process proceeds to step <#120>.

First, the motor (M) rotates clockwise <11120> in FIG. 20(d). The feeding cam (14) starts rotating counterclockwise in conjunction with the rotation of the motor (M), and the lens initial state detection switch (S3) and lens area detection switch (S5) are opened with the composition. 12L L2
2>.

As the delivery cam (14) rotates counterclockwise, the delivery lever (18), whose second cam surface (14c) is in contact with the third pin (18c), is rotated clockwise. As a result, the shutter block (4) and the movable lens barrel (8) are retracted to the rear side in the optical axis (L) direction.

During the rotation of the feeding cam (14) in the counterclockwise direction, the second
As shown in Figure 0 (c), the third part of the feeding lever (1B)
The pin (18c) is connected to the second cam surface (14) of the feeding cam (14).
c), and the second pin (18b) of the feeding lever (18) touches the first cam surface (14b) of the feeding cam (14).
, the second pin (18b) of the feeding lever (18) moves along the first cam surface (14b) as the feeding cam (14) rotates counterclockwise. The rotation of the feed lever (18) is controlled.

When the lens initial state detection switch (S3) is closed by rotating the feeding cam (14) to a position corresponding to the infinity position of the standard photographing area of the photographic optical system (PS), (
#123>, short both ends of the motor (M) to stop its rotation (#124>. This completes the 20th
Return to the initial state of the standard shooting state shown in figure (ri).
<#130>.

During this switching, the magnet (17) is not energized, and the stop lever (16) is rotated in a direction in which its pawl (16a) engages with the ratchet portion (14a) of the delivery cam (14). However, the rotation direction of the feeding cam (14) is counterclockwise, and the pawl (16a) and the ratchet part (14)
There is no problem since rotation is not prohibited due to engagement with a). However, instead of this configuration, the magnetometer (17) may be operated during switching to separate the pawl (16a) from the ratchet part (14a), thereby avoiding the generation of noise during rotation. .

As already explained, with this switching, the secondary lens (
7) is evacuated from the photographing optical path.

In summary, the motor (M), the gear train (15), the feeding cam (14), the feeding lever (18), the shutter block (4), the movable lens barrel (8) fixed thereto, etc. It constitutes a focal length switching mechanism that switches the focal length of the optical system (PS).

In addition, when installing a focal length switching lever (2°) instead of the focal length switching button (2), this lever (2°)
The lens changeover switch (S2) may be configured to close each time the lens is moved between the <5TND> and <position E> positions.

(3) Focus adjustment operation in the telephoto shooting state In the initial state of the telephoto shooting state shown in Fig. 20 (d), the photographing optical system (P
S) (consisting of a main lens (4a) and a sub-lens (7)) is focused at an infinity position.

In this state, the pawl (16a) of the stop lever (16) is connected to the ratchet portion (14a) on the outer peripheral surface of the feeding cam (14).
It is in contact with other parts. Further, the iron piece (20) is in contact with the magnet (17).

The third pin (18c) of the feeding lever (18) is in contact with the second cam surface (14c) of the feeding cam (14), thereby causing the front side in the optical axis (L) direction (upper part in the figure) The shutter block (4) is positioned. Also, the second pin (18b) of the feeding lever (18)
is not in contact with the first cam surface (14b) of the feeding cam (14).

At this time, the lens initial state detection switch (S3) and the lens area detection switch (S5) are closed, and the other switches (SL), (S2), and (S4) remain open (Fig. 21). (See <#0>; only step numbers are listed below).

Release switch (Sl) is released by operating the release button (1).
) is closed #1>, the magnet (17) is activated to attract the iron piece (20) #2>, and the motor (M) starts rotating counterclockwise in Fig. 20 (A). <
#3〉. Then, the feeding cam (1
4) begins to rotate clockwise in the figure, and the lens initial state detection switch (S3) is opened (#4).

As the feeding cam (14) rotates, the feeding lever (18)
The third pin (18c) moves along the second cam surface (14C) of the feeding cam (14), and the feeding lever (18) rotates around the axis (X4). As a result, the shutter block (4) is moved toward the optical axis (L) by the biasing force of the spring (6).
It is rolled out in the forward direction.

According to the rotation of the feeding cam (14), the lens position detection switch (S4) is repeatedly opened and closed (l+5.6>, and when the photographic optical system (ps) reaches the in-focus position, the motor (
After shorting both ends of M) to stop its rotation, <
#7), cut off the power to the magnet (17) <#8>
.

As a result, the stop lever (16) is moved by the spring (
19), the claw (16a) rotates counterclockwise around the axis (x3) as shown in Fig. 20 (*).
engages with the ratchet portion (14a) of the feeding cam (14) to position the feeding cam (14).

After that, start the timer <#9>, perform the shutter opening/closing operation (#10>, and wait until the completion of the shutter opening/closing operation (#11>). When the shutter opening/closing operation is completed, the motor (M) starts as shown in FIG. Start rotating clockwise at <#12>.

Then, the feeding cam (14) starts rotating counterclockwise in the figure via the gear train (15). Accordingly, the feeding lever (18) rotates clockwise, and the shutter block (
4) and the movable lens barrel (8) are retracted to the rear side in the optical axis (L) direction.

When the feeding cam (14) reaches the initial position, the lens initial state detection switch (s3) is closed <#13>.

Thereafter, both ends of the motor (M) are short-circuited to stop its rotation <#14>, and the power to the magnet (17) is cut off <115>.

As a result, the initial state shown in FIG. 20(d) is returned <#16>.

On the other hand, when the aforementioned photographic optical system (PS) switches between the standard photographing state and the telephoto photographing state, the magnification is also switched in the finder optical system (FS) in conjunction. Next, the configuration for this purpose will be explained.

The finder optical system (FS) is shown in Figures 1 and 23 (
As shown in <), (a), and (c), the optical axis (L
) from the front 4'/ side: objective lens (25), variable magnification lens (26), field frame (27), eyepiece lens (28), presser plate (29),
It is composed of a frame plate (30) and the like. The finder optical system (FS) is housed inside the upper half (5B), which is a cylindrical second mounting frame, of the integrally molded fixed base plate (5).

As shown in Figure 1, the upper half (5B) of the fixed base plate (5)
In addition, a near-infrared light emitting element (31) constituting a light emitting unit for performing automatic focus adjustment in an active manner, and
A condensing lens (32) and a light receiving element (33), which are light receiving sections, are provided. A frame member (34) having a light emitting window (34a), a light receiving window (34b), and a finder window (34c) covers the light emitting part, the light receiving part, and the front of the finder optical system (FS). However, the fixed base plate (
5) is fixed.

As shown in FIG. 1 and FIG. 24 (A), (11), and (C), the objective lens holder (35) that holds the objective lens (25) in the finder optical system (FS)
has a cylindrical portion (35A) along the optical axis (L) direction. This cylindrical portion (35A) is fitted onto a guide shaft (36) fixed to the fixed base plate (5), so that the objective lens (25) can move in the direction of the optical axis (1,). It is composed of

Further, the variable magnification lens holder (37) that holds the variable magnification lens (26) is attached so as to be rotatable around the axis (χ7), so that the variable magnification lens (26) is exposed to the viewfinder optical path. It is configured so that it can be withdrawn. Then, the variable magnification lens (2) is inserted through the variable magnification lens holder (37).
6) is provided with a spring (not shown) that biases the lens in the direction of inserting the lens into the finder optical path.

FIG. 23(A) and FIG. 24(A) show the standard photographing state. In this state, as will be described later, the objective lens (
25) is located at the forefront of its movement range. The variable magnification lens (26) is inserted into the finder optical path by the biasing force of a spring.

FIG. 23 (II+) and FIG. 24 (I+) show the finder magnification switching operation performed in conjunction with the focal length switching operation in the photographic optical system (PS) described above. As will be described later, the objective lens (25) is configured to be moved rearward (to the left in the figure) in the direction of the optical axis (L) in conjunction with the switching of the focal length.

With this movement of the objective lens (25), the lower edge of the objective lens holder (35) changes to the variable magnification lens holder (37).
) and press it against the front end surface. As a result, the variable power lens holder (37) resists the biasing force of the spring.
It is rotated counterclockwise in the figure.

As shown in FIGS. 23(c) and 24(c), when the objective lens (25) reaches the end of its moving range, the variable magnification lens (26) is completely removed from the finder optical path. It is configured to evacuate to This state is a telephoto shooting state, and the magnification of the finder optical system (FS) is different from the standard shooting state due to the movement of the objective lens (25) and the retraction of the variable magnification lens (26).

As shown in FIGS. 23(a) to 23(c), the stepped portion of the eyepiece (28) abuts the stepped portion of the fixed base plate (5) from the front, and the field frame ( 27
) are positioned by elastic contact.

Further, a semi-transparent plating frame is formed on the frame plate (30) so that the frame indicating the photographing range can be seen within the field of view of the finder. The frame plate (30) is positioned by the presser plate (29) elastically abutting from the front side, and is prevented from falling out by abutting the bent portion (29a) of the presser plate (29) from above. has been done.

As shown in FIGS. 24(a) to 24(c), the cylindrical portion (35A) of the objective lens holder (35) has two pins (hereinafter referred to as an upper pin and a side pin, respectively) at the top and side. (35a) and (35b) are planted.

Among them, a spring (
38) has been constructed. Pin (5b) of fixed base plate (5)
) is the objective lens holder (35) in side view.
It is located approximately at the center of the movement range of the upper pin (35a).

The spring (38) is attached to the objective lens holder (35).
) is connected to the pin (5) of the fixed base plate (5).
b) The objective lens holder (35) is biased and pressed forward when located in front of b), and conversely, the objective lens holder (35) is biased and pressed rearward when located in the rear. There is.

On the other hand, the side pin (35b) of the objective lens holder (35)
) is the bifurcated part (39a) at the upper end of the switching operation lever (39).
) is fitted. This switching operation lever (39) is attached so as to be rotatable around the axis (x8), and the objective lens holder (35) is configured to move back and forth as the switching lever (39) rotates. There is.

As described above, the objective lens holder (35) is moved forward ( The front end or the rear end of the cylindrical portion (35A) is pressed in either direction (standard shooting state side) or backward (telephoto shooting state side), and the front end or rear end of the cylindrical portion (35A) is pressed against the back surface (34d) of the frame member (34) or the fixed base plate. It is configured to be positioned by coming into contact with the contact portion (5C) of (5).

The switching operation lever (39) has a bevel gear part (39) on the opposite side of the bifurcated part (39a) across the rotation axis (X8).
b). This bevel gear part (39b) has
As shown in FIG. 1 and FIGS. 25(A) and (υ), a bevel gear (40) in which a gear portion (40a) consisting of two teeth is formed only in a part of the circumferential direction is opposed.

This bevel gear (40) is shown in Fig. 1 and Fig. 25 (A).

(rl), and as shown in FIG.
41) to the gear (42). moreover,
A gear (44) that rotates together with a gear (43) meshing with this gear (42) is a gear for transmitting drive from the motor (M) to the feeding cam (14) in the photographing optical system (PS) described above. One gear (15a) in row (15)
It's interlocking.

That is, in conjunction with the forward and reverse rotation of the motor (M), the bevel gear (4
0) rotates. The gear portion (40a) of this bevel gear (40) is configured to mesh with the bevel gear portion (39b) of the switching operation lever (39) only during the focal length switching operation in the photographic optical system (PS). has been done.

Due to the engagement between the gear part (40a) and the bevel gear part (39b), the switching operation lever (39) rotates around the axis (x8), and as mentioned above, the magnification of the finder optical system (FS) is switched. It is configured so that

Figure 28 (a) or c) shows the switching operation lever (39
) and Hehergia (40) in a plan view, and is developed along line XX in the sectional view seen from the front direction shown in FIG. 25(A).

<1> Standard shooting condition FIG. 28(a) shows a standard photographing state.

The gear part (40a) of the bevel gear (40) is [a] in the figure.
The position is the initial state. At this time, the photographing optical system (PS) is focused on an infinite position. From this initial state, by driving the motor (M), the bevel gear (40) is rotated clockwise and reaches the position [b] in the figure.

During this time, a focus adjustment operation is performed in the standard photographing state.

That is, at the position [b] in the figure, the photographing optical system (PS) focuses on the closest position.

Also, during this time, the gear part (40a) of the bevel gear (40)
is not engaged with the bevel gear portion (39b) of the switching operation lever (3). Therefore, the finder optical system (F
No switching of magnification is performed in S), and the finder optical system (FS) is set to a magnification suitable for standard shooting conditions. At this time, the switching operation lever (39) is
As shown in b), the person is leaning forward.

(2) When switching the focal length When switching the focal length from the standard shooting state to the telephoto shooting state, the bevel gear (40) is further rotated clockwise beyond the position [b] in Fig. 28 (a). Gear part (4
0a) reaches the position [c] in the figure, and the switching operation lever (3
) is about to engage with the bevel gear part (39b). During this time, as before, the finder optical system (FS
) The magnification is not changed in the play mode, and the finder optical system (FS) remains at the magnification appropriate for standard shooting conditions.

The gear part (40a) of the bevel gear (40) is indicated by [C] in the figure.
During the transition from the position to the [dl position, the bevel gear (39b) of the switching operation lever (39) is engaged and the lever (39) is rotated counterclockwise in FIG. 27(0). As shown in FIG. 28 (rl), when the gear part (40a) of the bevel gear (40) reaches the position [dl in the figure and disengages from the bevel gear part (39b), the switching operation lever (39) is in a backward leaning position as shown by the solid line in FIG. 27(b).

At this time, the bifurcated portion (39a) of the switching operation lever (39)
The upper pin (
35a) is located behind the pin (5b) of the fixed base plate (5), and then, as already mentioned, the objective lens holder (35) is moved backward by the biasing force of the spring (38). When pressed, the switching operation lever (39
) is further tilted backwards, as shown in FIG. 27(c).

As the objective lens holder (35) moves backward, the objective lens (25) moves to the rear end of its movement range, the variable magnification lens (26) retreats from the finder optical path, and the finder optical system (FS ) is a magnification suitable for telephoto shooting conditions. Further, the bevel gear portion (39b) of the switching operation lever (39) has moved to the position shown in FIG. 28(c).

After the gear part (40a) of the bevel gear (40) comes off the bevel gear part (39b) of the switching operation lever (39),
As the bevel gear (40) is further rotated, it reaches the position [e] shown in FIGS. 28(0) and (c), and the rotation of the bevel gear (40) stops at this position. During this time, the gear portion (40a) of the bevel gear (40) does not mesh with the bevel gear portion (39b) of the switching operation lever (39) again. Therefore, the magnification of the finder optical system (FS) is not switched, and the finder optical system (FS) remains at the magnification suitable for the telephoto shooting state in the playback state.

In the photographic optical system (PS), the bevel gear (
The gear part (40a) of 40) is shown in FIG. 28(a) [b
The lens is configured so that the focal length is switched between the position [e] shown in FIG. 28(c). Then, the gear part (4) of the bevel gear (40)
When 0a) is at position [e] in Figure 28 (c),
This is the initial state of telephoto shooting. At this time, the photographing optical system (PS) is focused at an infinite position.

When switching the focal length from the telephoto shooting state to the standard shooting state, the bevel gear (40) is rotated counterclockwise from the position [e] in FIG. d゛] position and engages with the bevel gear portion (39b) of the switching operation lever (39).

Then, the gear part (40a) of the bevel gear (40)
From the position [d゛] in Figure 8 (C) to [C] in Figure 28 (B)
The switching operation lever (39) is rotated clockwise in FIG. 27 (rl) while moving to the position shown in FIG. The bevel gear (40) is further rotated, and its gear portion (40a
) is the bevel gear part (39a) of the switching operation lever (39)
When it comes off, the switching operation lever (39) is
As shown by the two-dot chain line in TI), the patient leans forward. After that, the switching operation lever (39) moves the objective lens holder (
35) is moved forward by the biasing force of the spring (38), and is further rotated, returning to the forward leaning position in the initial state shown in FIG. 27(A).

When the objective lens (25) moves to the front end of its movement range as the objective lens holder (35) moves forward, the variable magnification lens (26) is inserted into the finder optical path, and the finder, - Return the optical system (FS) to the magnification appropriate for standard shooting conditions. Also, bevel gear (40
) is further rotated, and when its gear portion (40a) reaches the position [a] shown in FIG. 28(a), its rotation is stopped.

(3) Telephoto shooting state From the initial state of the telephoto shooting state in which the gear part (40a) of the bevel gear (40) is at the position [e] in FIG. 28(c),
Driven by the motor (M), the bevel gear (40) is rotated clockwise and reaches the position [f] in the figure. During this time, a focus adjustment operation is performed in the telephoto shooting state. That is, in the figure [
f], the photographing optical system (PS) is focused on the closest position.

Also, during this time, the gear part (40a) of the bevel gear (40)
is the bevel gear part (39a) of the switching operation lever (39)
are not engaged. Therefore, the finder optical system (
FS), the magnification is not switched, and the magnification remains appropriate for the telephoto shooting state.

That is, as described above, the objective lens holder (35) is movable back and forth, the variable magnification lens holder (37) moves in and out of the finder optical path by swinging, the switching operation lever (39), and the spring (38). ) etc. constitute a finder magnification switching means for switching the magnification of the finder optical system (FS).

As described above, the gear portion (40a) of the bevel gear (40) is operated by the switching operation lever (39) only when the focal length is switched in the photographic optical system (PS).
) engages with the hevel gear part (39b) of this lever (
39) around the axis (Xs) to change the magnification in the finder optical system (FS).

That is, the bevel gear (40) in which the gear portion (40a) is formed only in a part of the circumferential direction, the spring (41), and the three gears (42) to (44) are the gear (40) that is the movable member of the operating means. 15a) and the switching operation lever (39), which is a movable member of the finder magnification switching means, are connected to the photographic optical system (P
It constitutes an interlocking means that is interlocked only during the focal length switching operation in step S).

During the focus adjustment operation in the photographing optical system (P'S) in the standard shooting state and the telephoto shooting state, the linkage between the finder magnification switching means in the finder optical system (FS) and the motor (M) is cut off. Although the configuration is such that a single motor (M) performs focus adjustment and focal length switching of the photographic optical system (PS) and magnification switching of the finder optical system (FS), the motor (M) is not driven. By using it efficiently, the load can be reduced.

On the other hand, Figure 25 (a), (■), and Figure 29 (a)
, (b), the outer peripheral surface of the hevel gear (40), excluding the gear part (40a), has an overhang part (40).
b) is formed. In addition, the switching operation lever (39)
A protrusion (39c) is formed at the lower end of.

The projecting portion (40b) of the bevel gear (40) is shown in Fig. 25 (
As shown in FIG. 29(a) and FIG. 29(a), the gear portion (40a) of this bevel gear (40)
When meshing with the bevel gear part (39b) of
It is located in a position that does not contact the protrusion (39c) of the switching operation lever (39), and the axis (X,) of the switching operation lever (39)
It is designed not to prevent rotation around it.

Further, as shown in FIGS. 25(B) and 29(B), the gear portion (40a) of the bevel gear (40) does not mesh with the hevel gear portion (39b) of the switching operation lever (39), When the finder optical system (FS) has a magnification suitable for either the standard shooting state or the telephoto shooting state, the protrusion (40b) of the hevel gear (40) is connected to the protrusion (39c) of the switching operation lever (39). It is located opposite to.

The projecting portion (40b) of the bevel gear (40) and the protrusion (39c) of the switching operation lever (39) are slightly apart. In this state, the finder optical system (FS)
When some external force is applied to rotate the switching operation lever (39) around the axis (X8), the switching operation lever (39)
rotates slightly and its protrusion (39c) connects to the bevel gear (4).
0) and prevents subsequent rotation of the switching operation lever (39) around the axis (x8).

This prevents the objective lens holder (35) from moving to a position where its upper pin (35a) exceeds the pin (5b) of the fixed base plate (5), and the switching operation lever (39
) is returned to the correct position by the urging force of the spring (38).

In other words, even when vibrations or the like are applied, the magnification of the finder optical system (FS) is prevented from being changed inadvertently.

In the previous embodiment, in the operation mechanism that slides the main lens (4a), which is the front lens of the photographic optical system (PS), toward the retracted position against the biasing force of the spring (6), the motor (M) is An interlocking feeding cam (14) is used as an operation side member,
Shutter block (4) that holds the main lens (4a)
A feeding lever (18) that is interlocked with the feeding lever (18) is the operated member, and flexibility is formed between the feeding cam (14) and the feeding lever (18) to allow the operated member to move toward the retracted position. Although the configuration described above has been described, the specific configuration of this operating mechanism can be changed as appropriate. Next, some examples will be explained.

In the system shown in Fig. 31, a plywood (45) that holds the front lens (not shown in this figure) of the photographic optical system (PS) is moved forward and backward along a pair of guide rods (46a) and (46b). The plywood (45) is biased forward by the spring (6), and the base plate (45) comes into contact with the plywood (45) from the front and resists the biasing force of the spring (6). a regulating member (47) that regulates the movement of the member (45);
) is a male screw member (4) that rotates in conjunction with the motor (M).
8) is screwed together.

In the case of this configuration, the flexibility that allows the operation of the plywood (45), which is the operated side member, toward the retracted position with respect to the regulating member (47), which is the operating side member of the operating mechanism, is that the regulating member (47)
The plywood (45) is in partial contact with the plywood (45) from the front side thereof, and is configured to allow the plywood (45) to move toward the rear side.

The structure shown in FIG. 32 is a modification of the configuration shown in FIG. 31, in which the regulating member (47) and the motor (M) are linked with each other by screws, and a rank (47) is formed on the regulating member (47). 47a) and a binion (49) linked to the motor (M)
It is designed to be linked by. Since the other configurations are the same as those shown in FIG. 31, the same numbers will only be assigned and detailed explanations will be omitted.

Note that the number of stages of focal length switching in the photographic optical system (PS) may be three or more stages.

〔Effect of the invention〕

As described above, the focal length switching type camera according to the present invention absorbs the force applied to the member holding the front lens when the front lens is in the protruding position, so that no unreasonable force is applied to the focal length switching mechanism. Although it is designed to return to its original state when the force is removed, it is designed to prevent damage to the focal length switching mechanism without interfering with smooth shooting operation. became.

[Brief explanation of the drawing]

The drawings show an embodiment of the focal length switching type camera according to the present invention, in which FIG. 1 is an exploded perspective view of a photographing optical system and a finder optical system, FIG. 2 is an overall plan view, and FIGS. B)
is a rear view of the shutter block, FIG. 3 (a) shows the standard shooting state, and FIG. 3 (rl) shows the telephoto shooting state.
Figure 4 is an enlarged rear view of the main parts of the shutter block in the standard shooting state, Figure 5 is an exploded perspective view of the shutter block, movable lens barrel, and part of the means for moving in and out of the sub-lens, and Figure 6 is the sub-lens. 7th exploded perspective view of part of the means for egress and egress for the
The figure is an enlarged side view of a part of the means for moving in and out of the sub-lens, Fig. 8 is a perspective view of the cam surface of the fixed base plate, and Fig. 9 (a) to c) shows the shutter block, movable lens barrel, and sub-lens. FIG. 9(a) is a schematic plan view showing the relationship between the egress and egress means, and FIG. 9(a) shows the standard shooting state, FIG. 9(υ) shows the focal length switching state, and FIG. 9(c) shows the telephoto shooting state. , Fig. 10 is a perspective view of the photographing optical system in the standard shooting state, Fig. 11 is a perspective view of the feeding cam and feeding lever, Fig. 12 is a sectional view of the feeding cam and feeding lever, and Fig. 13 is the feeding cam. plan view of
Fig. 14 is a developed view of the short focal length side focus adjustment cam surface of the feeding cam, Fig. 15 is a plan view of the adjusting means for the support lever of the feeding lever, and Fig. 16 is a plan view of the brush for position detection of the feeding cam. , Fig. 17 is a plan view of the position detection pattern of the gear base plate, Fig. 18 is a bottom view of the gear base plate, Fig. 19 is a circuit diagram around the control device, and Fig. 20 (a) to *). 20(a) is a plan view of the drive mechanism for the photographing optical system, and FIG. 20(a) is the initial state in which the photographing optical system is focused at infinity in the standard photographing state, and FIG. 20(a) is in the standard photographing state. The photographic optical system is focused on the closest position, Fig. 20 (c)
20 (=) is the initial state when the photographing optical system is focused on the infinity position in the telephoto shooting state;
Figure (N) shows the state in which the photographing optical system is focused on the closest position in the telephoto shooting state, Fig. 21 is a flowchart of the focus adjustment operation, Fig. 22 is a flowchart of the focal length switching operation, and Fig. 23 is a flowchart of the focal length switching operation. Figures (A) to (C) are longitudinal cross-sectional views of the finder optical system, and Figure 23 (A) shows the standard shooting condition.
FIG. 23(b) shows the focal length switching state, FIG. 23(c) shows the telephoto shooting state, FIG. 24(a) or c) is a side view of the finder magnification switching means, and FIG. stomach)
24(B) shows the standard shooting state, FIG. 24(B) shows the telephoto shooting state, FIG. 24(C) shows the telephoto shooting state, and FIGS. 25(A) and (TI) show the connection between the switching operation lever and the bevel gear. FIG. 25(a) is a cross-sectional view showing the focal length switching, FIG. 25(b) is a cross-sectional view showing the focus adjustment, FIG. 26 is a schematic cross-sectional view of the interlocking means, and FIG. 27(a) 27(a) is a side view of the switching operation lever, FIG. 27(a) is in the standard shooting state, FIG. 27(II) is when changing the focal length, and FIG. 27(c) is the side view of the switching operation lever.
28(a) to 28(c) are X-X line development views in FIG. 25(a) showing the relationship between the bevel gear part of the switching operation lever and the gear part of the bevel gear, respectively. Figure 28 (a) is the standard shooting condition, Figure 28 (b)
28 (c) shows the telephoto shooting state, and FIG. 29 (a) and (II) are plan views showing the relationship between the protrusion of the switching operation lever and the protrusion of the bevel gear. ,
Figure 29 (a) is when switching the focal length, Figure 29 -
(II) shows the time of focus adjustment, FIG. 30 is a plan view of a part of the camera showing another embodiment of the switching operation tool, and FIGS. 31 and 32 each show another implementation of the focal length switching mechanism. FIG. 2 is a schematic diagram illustrating an example. (3)...Camera body, (4a)...
・Front ball, (6)...Spring, (14),
(47)......operating side member, (18), (
45)...Operated side member, (PS)...
・Photography optical system.

Claims (1)

[Claims] A focal length switching type with a focal length switching mechanism that switches the focal length by sliding the front lens of the photographic optical system along the optical axis between a position where it protrudes from the camera body and a retracted position closer to the camera body. In the camera, the focal length switching mechanism includes a spring that biases the front lens toward a protruding position, and an operation mechanism that slides the front lens toward a retracted position against the biasing force of the spring, Between the operating side member and the operated side member of this operating mechanism,
A focal length switching type camera having a flexibility that allows an operated member to move toward a retracted position relative to an operating member.