JPH0534769A - Camera - Google Patents

Abstract

PURPOSE:To prevent defective actuation from occurring by providing a delay time between the time when a barrier operating knob is operated and the time when a lens barrel extending action is started. CONSTITUTION:In a camera with the knob for operating a barrier opening at the front surface of a photographing lens, the extending action of the lens barrel from the camera main body is executed by turning on the knob and the restoring action thereof is executed by turning off the knob, a delay means 216 which starts the extending or the restoring action of the lens barrel after the fixed delay time is provided. That means, the delay circuit 216 is provided in the driving circuit of the lens barrel and actuated by turning on the operating knob of a lens barrier. Then, the extension of the lens barrel is executed after the prescribed time. Besides, the switching of a focus and focusing are executed by a motor 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has at least two focal lengths such as telephoto shooting in which a sub lens is inserted on the optical axis of a main lens and wide shooting in which the sub lens is retracted from the optical axis. The present invention relates to a variable focus camera capable of shooting.

[0002]

2. Description of the Related Art Conventionally, as a variable focus camera, in addition to the above-described two-focus type, a zoom type in which a large number of selectable focal length changes are continuously provided is widely known.
In many of these cameras, an openable / closable barrier is provided on the front surface of the lens to protect the photographing lens during non-photographing. This barrier is disclosed, for example, in JP-A-63-9.
As shown in No. 5426, many of them are opened and closed by the driving force of a motor for switching the focal length.

[0003]

However, the above-mentioned conventional example has the following drawbacks.

(1) Since the driving force of the motor for switching the focal length is used to open and close the barrier, the interlocking mechanism for transmitting the driving force becomes very complicated, which is an obstacle to realizing a compact and inexpensive camera. Become.

(2) The load on the motor is large and the life of the battery is shortened.

In order to solve these drawbacks, it is conceivable to provide a barrier operating knob on the front surface of the lens barrel and directly open and close the barrier manually, but static pressure when operating the barrier operating knob is applied to the lens barrel. However, there is a problem in that the load at the time when the lens barrel starts the extension operation becomes heavy and malfunction occurs.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art by providing a delay time between the operation of the barrier operation knob and the start of the lens barrel extension operation. The lens barrel is driven after the force applied to the operation knob is weakened.

According to the present invention, since the driving force of the motor for switching the focal length is not used for opening and closing the barrier, the interlocking mechanism for transmitting the driving force is unnecessary, and a compact and inexpensive camera can be realized.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a vertical sectional view of a camera according to an embodiment of the present invention, and FIG. 2 is a horizontal sectional view of the camera of FIG.

In these figures, reference numeral 1 is a male helicoid, 2 is a female helicoid screwed with the male helicoid 1, and a full circumference gear portion 2a is formed on the outer circumference.
3 is rotatably fitted and held. The male helicoid 1 that is screwed into the female helicoid 2 (which makes almost one rotation with respect to the camera body 13) is provided with a front lens and a shutter unit, which will be described later, which constitute a photographing optical system, and the male helicoid 1 is rotated by the rotation of the female helicoid 2. It moves linearly on the optical axis using a straight-ahead key 26 described later as a guide. 38 is male helicoid 1
A front lens composed of a plurality of lenses fixed to the shutter, 7 a shutter base plate, 8 shutter blades, and 9 a pressing plate. The shutter base plate 7, the shutter blades 8, and the pressing plate 9 constitute a shutter unit. The unit is fixed to the male helicoid 1 by a shutter base plate 7. 6 is a rear lens holder, which is a rear lens 39 composed of a plurality of lenses.
It is configured so that it can be inserted and retracted with respect to the photographing optical axis (on the side opposite to the linear key 36 described later with respect to the photographing optical axis). Accordingly, when the rear lens 39 is retracted from the photographing optical axis, the photographing optical system has a short focal length only by the front lens 38, and when the rear lens 39 is inserted in the photographing optical axis, the front lens 38 and the rear lens 39 are combined. Therefore, the photographic optical system has a long focal length. Reference numeral 10 denotes a rear ball holder shaft held by the male helicoid 1 so as to be slidable in the optical axis direction, and holds the rear ball holder 6 rotatably in the axially slidable state. A compression spring 34 biases the rear lens holder shaft 10 forward in the optical axis direction (left side in FIG. 2). Reference numeral 35 is a stopper washer which functions as a stopper for the compression spring 34. Reference numeral 37 denotes a cam fixed to the camera body 13 for inserting and retracting the rear lens 39 with respect to the photographing optical axis, which is shown in FIGS. 3 and 4 in which the lens barrel is viewed from the rear surface (right side of FIG. 1) of the camera. As described above, in wide shooting, the rear lens 39 is in a position retracted from the optical axis as shown in FIG. 3, and in tele shooting is in a position inserted in the optical axis as shown in FIG. . 40 is the rear lens holder 6
Is a tension spring that urges to rotate counterclockwise in FIG.

Further, as shown in detail in FIGS. 3 to 6, the cam 37 is integrally provided with a cam stopper portion 81 having a projecting locking portion 81a, and the locking portion 81a is a rear lens. The teleconverter stopper portion 82 integrally fixed to the end portion of the holder 6 can be engaged. As a result, at the time of focusing during wide-angle shooting, the rear lens holder 6 having the front lens 38, the shutter base plate 7 and the rear lens 39 integrally moves with the male helicoid 1 straight ahead in the optical axis direction. At the time of focusing, the rear lens holder 6 resists the compression spring 34 in order to prevent the teleconverter stopper portion 82 from moving forward in the optical axis direction by engaging the locking portion 81a of the stopper portion 81 provided on the cam 37. While rear ball holder 6
Is left from male helicoid 1 and only male helicoid 1 moves forward (FIGS. 4 and 6). That is, during focusing during telephoto shooting, only the front lens 38 and the shutter base plate 7 are integrally fed forward and the rear lens holder 6 is moved.
Remains in that position as if it were fixed to the camera body 13.

Reference numeral 3 is a barrier operating ring which opens and closes the two barriers 4 and 5 in front of the taking lens.
FIG. 7 shows the barrier mechanism seen from the left side of FIG. 1, that is, from the front of the camera. In this figure,
An operation knob 3a is integrally provided on the barrier operation ring 3, and the knob 3a can be operated from the front side of the camera. Reference numeral 3b denotes a thin-walled spring portion provided integrally with the barrier operation ring 3, and the protrusions of the spring portion 3b engage with the recesses of the engaging portion 1a of the male helicoid 1 to open and close the barriers 4, 5. I try to give a feeling of click. Reference numerals 83 and 84 denote tension springs that urge the barriers 4 and 5 to rotate in the closing direction.

Referring back to FIGS. 1 and 2, 11 is a decorative plate attached to the front surface (left side of FIGS. 1 and 2) of the male helicoid 1, 12 is a front plate, 13 is a camera body, and 14 is a camera exterior. It is a cover to be formed. Reference numeral 16 is a barrier contact piece for detecting opening / closing of the barriers 4 and 5 shown in FIG. The flexible receiver 36 is integrally provided on the camera body 13 and is a straight-moving key extending in parallel with the optical axis to prevent rotation of the male helicoid and to parallel the male helicoid 1 to the optical axis with respect to the rotation of the female helicoid 2. The flexible printed circuit board 17 is guided and held on the outer side thereof. 19 is a DX contact piece, 31 is a gear pressing plate, and the front plate 1
2 is attached to a pivot of a pulse gear 26, which will be described later, for driving the female helicoid 2. Reference numeral 32 is a pressure plate for pressing and urging a film (not shown) toward the aperture side, and 33 is a cartridge. Reference numeral 52 is a sprocket having teeth that mesh with perforations of a film (not shown), and 53 is a sprocket gear integrated with the sprocket 52.

FIG. 8 is a perspective view showing the drive mechanism of the lens barrel of FIG. 1. In FIG. 8, 20 is a motor for switching focus and focusing, 21 is a pinion gear fixed to the output shaft of the motor 20. , Gears 22, 23, 24, 2
The driving force of the motor 20 is transmitted to the pulse gear 26 via 5. The pulse gear 26 meshes with the entire circumference gear portion 2 a of the female helicoid 2 to drive the female helicoid 2 and has a pulse plate 27 fixed to the upper surface. Reference numeral 30 denotes a pulse contact piece which is adapted to detect the wide end and the tele end of the male helicoid 1 in combination with the pulse plate 27. 28 is a slit plate integrally attached to the pinion gear 21,
Reference numeral 29 is a photo interrupter, and the combination of the two is used to know the position of the male helicoid 1 in the optical axis direction during focus adjustment by counting the number of pulses.

Next, the operation of the above configuration will be described.

First, the barrier operating ring 3 is operated from the sinking state (the state where the male helicoid 1 is retracted to the innermost position) where the barriers 4 and 5 are closed and the female helicoid of the camera is turned off. When the barriers 4 and 5 are fully opened by turning on, the main switch by the barrier contact piece 16 is turned on, and the motor 20 rotates forward (clockwise in FIG. 8). This causes the pulse gear 26 to pass through the gears 21 to 25 shown in FIG.
Rotates, and the female helicoid 2 rotates via the entire circumference gear portion 2a. With this rotation, the male helicoid 1 screwed inside the female helicoid 2 is forward in the optical axis direction (upper side in FIG. 8).
Move to. Then, the pulse contact piece 30 becomes the pulse gear 26.
The pattern 27 of the pulse plate 27 integrated with it by the rotation of
When a (FIG. 9) is detected for the first time, the motor 20 is reversely energized for a predetermined time and then turned off. As a result, the pulse gear 2
6 stops just before the pattern 27a shown in FIG. 9B. This position is the wide end and becomes the initial position (focusing standby position) in the wide shooting state. When a shutter release button (not shown) is pressed at this position, the motor 20 is rotated in the normal direction again after the distance measurement is completed, and the male helicoid 1 having the front lens 38 is fed out to start focusing by the front lens 38. At this time, the shutter base plate 7 also moves integrally with the male helicoid 1 in the optical axis direction. At this time, the rear lens holder shaft 10 is biased by the compression spring 34 to move integrally with the male helicoid 1, and the rear lens 39 held by the rear lens holder shaft 10 also moves outside the photographing optical path together with the male helicoid 1. Move along the optical axis.

Focusing is completed by male helicoid 1
The motor 20 is turned off when it is detected that the predetermined position at which is focused is reached. Here, the detection of the predetermined position counts the number of pulses by detecting the slit plate 28 rotating integrally with the pinion gear 21 by the photo interrupter 29. The counting is started by energizing the motor 20 by the release signal to turn on the motor 20, the pulse gear 26 starts rotating, and the pulse contact piece 30 detects the pattern 27a of the pulse plate 27.

When the focusing is completed and the shutter blade 8 is opened and closed by a driving mechanism (not shown), the exposure of the film is completed. Thereafter, the motor 20 is reversely energized, the pulse gear 26 rotates clockwise, and the male helicoid 1 is retracted. Then, the pulse contact piece 30 detects the C position of the pattern 27a, and after a certain period of time, the motor 20 is turned off to reset to the wide standby position (position B in FIG. 9).

Next, the case of telephotographing will be described. From the sinking state, the motor 20 is rotated counterclockwise to rotate the female helicoid 2. With this rotation, the male helicoid 1 moves forward in the optical axis direction. The pulse gear 26 rotates and the pattern 27a of the pulse plate 27 is moved by the pulse contact piece 30.
The motor 20 is reversely energized for a minute time and then turned off in the same manner as when it was stopped at the wide end at the time of the second detection.
Stop 6 This state is the telephoto end and is the initial position (focusing standby position) in the telephoto photographing state. That is, the pulse plate 27 rotates twice between the wide end and the tele end.

In this state, the cam 37 allows the rear lens holder 6 to
Is inserted on the optical axis, and the front lens 38 (that is, the main lens) and the rear lens 39 (the sub lens) both constitute a telephoto photographing optical system.

When focusing is started from this focusing standby position, the front lens 38 and the shutter base plate 7 are integrally moved in the optical axis direction to the in-focus position, as in the case of the wide-angle shooting described above.

On the other hand, at this time, in the rear ball 39, the teleconverter stopper portion 82 is engaged with the locking portion 81a of the stopper portion 81 provided on the cam 37, and the movement of the rear lens 39 toward the front in the optical axis direction is hindered. It is placed from the male helicoid 1 together with the rear ball holder 6 against 34 and remains stopped at that position.

That is, in focusing during telephoto shooting, only the front lens 38 and the shutter base plate 7 are integrally extended forward, and the rear lens holder 6 is held at that position as if it was fixed to the camera body 13. Become.

The other operations are the same as those in the case of the wide-angle shooting described above, and thus the description thereof will be omitted. Next, when the lens barrel moves from the wide end to the sinking end position, the motor 20 reverses by the operation opposite to the above, the pulse gear 26 rotates clockwise, and the male helicoid 1 is retracted. When the sinking end position is reached, a sinking end detection switch (not shown) is turned on, and the motor 20 is stopped.

Next, when moving from the telephoto end to the sinking end position,
Similarly, when the male helicoid 1 is drawn in and the sinking edge detection switch (not shown) is turned on at the sinking edge position, the motor 20 is stopped.

FIG. 10 shows a camera drive circuit for driving the above-mentioned camera.

Reference numeral 102 denotes a rotation detector composed of the slit plate 28 and the photo interrupter 29, and detects the rotation of the motor 20 as a pulse. 103 is a reduction gear corresponding to the above-mentioned gears 22 to 25, and its output shaft 104
The front gear 38 is driven by the pulse gear 26 provided on the output shaft 104, and the drive control of the front lens 38 is performed by the pulse plate 27 provided on the output shaft 104.

In the front lens 38, the movement to the right in the drawing is the feeding direction, and the opposite movement to the left is the feeding direction, that is, the collapsing direction. And when it reaches the predetermined retracted position,
The sunken position detection switch 108 is turned on and a sunken position detection signal is output. The pulse plate 27 is pulled up,
About 3 rotations of the pulse contact piece 30 correspond to the entrance and exit of the lens. 1
Reference numeral 10 is a tele wide (T / W) switch, 111 is an input code converter of the switch, and 3 is Wi for Tele.
When de, the signal of 1 is output to the line 112. Reference numeral 113 denotes a gate, which is a line 112 when the signal 114 is “High”.
Signal is sent to line 115, and when "Low", line 1
Transmit a zero signal to 15. Therefore, the signal on line 115 becomes the desired value for the lens position. Note that Tele = 3,
Wide = 1, zero when closed.

Reference numeral 116 denotes a barrier opening / closing switch which sets the line 114 to High when opened and Low when closed. The barrier contact piece 16 described above is one of the components of the barrier open / close switch.

First, when the lens is in the sinking position, the counter 117 is in the reset state, and the photographing sequence 147 is performed.
Goes down (line 148 is high), the barrier switch 116 is closed, that is, the line 114 is low.

On the other hand, to open the barrier, switch 116
Is turned on, and a High signal is output to the line 114. When the T / W switch 110 is operated to select tele or wide, the line 115 is selected according to the selection direction.
A signal of "1" or "3" is output to. Since the counter 117 is zero, the signal "0" on the line 118 is output.
Then, the value on the line 115 is compared by the comparator 119. In this case, since the value on line 118 is small, Hi on line 120
Output the gh signal.

Since the AND gate 201 is high, the output of the orage 202 is high, and the output of the inverter 205 is high because the line 204 is low.
The output of the AND gate 206 is also High, and the OR gate 12
The output of 2 also becomes High. Therefore, the counter 117
Is in up mode.

The change of the line 114 (operation of the switch 116) causes the change detector 123 to be High and the output of the mono-multi-inverter 124 to be Low for a short period of time (continues with a slight delay after the switch operation).

After a short time, the output of the line 125 becomes H.
High and the comparison in the comparator 119 do not match, the inverted output of the inverter 126 is High, and the OR gate 20
The output of 7 becomes High.

Therefore, the output of the AND gate 127 is H
The output of the OR gate 128 becomes High, the drive circuit 129 operates, and the output of the OR gate 122 becomes Hi.
Then, the motor 20 is rotated in the feeding direction, and the front lens 38 is fed.

The flip-flop 208 is initially in the reset state, the output of the OR gate 209 is Low, the output of the inverter 210 is High, the AND gate 211 is opened, the sinking end position detection switch 108 is turned off, and the pulse contact is made as it rotates. The piece 39 counts the number of feeds, and the counter 117 counts up.

When counting up to the number indicating the position indicated by the line 115, the comparator 119 detects a match, and since the match output is High, the output of the inverter 126 becomes Low and driving is stopped. Further, the output of the line 120 becomes Low, so that the counter 117 is set to down. However, things that are moving do not immediately stop in a fixed position. Then, the coincidence signal is received by the OR gate 212 and the flip-flop 213 is set. Therefore, the line 213 becomes High, the output of the AND gate 206 is set to Low through the inverter gate 205, and reverse rotation energization is performed through the OR gate 207.

Then, the OR gate 209 is set to High, the AND gate 211 is closed through the inverting gate 210, and the signal on the line 30 is stopped to the counter 117.
Since the line 30 has become High, it is reversed again and becomes Low, which means that the output of the inversion gate 214 is High.
Then, the output of the AND gate 215 is set to High, and then the reverse rotation is continued until the output of the delay circuit 216 becomes High.

After moving to a sufficient position, line 21
The output High of 7 causes the sequencer 147 to "wait".
Then, the flip-flop 203 is reset, and this reverse operation ends.

When the T / W switch 110 is operated, the tele / wide selection operation starts with a change in the value of the line 112, a change in the value of the line 115, and a change in the output of the comparator 119.

Depending on the size of comparison, the output of the AND gate 121 becomes High or Low, and the counter 117 goes up and down. Further, the output of the OR gate 122 also becomes High or Low, and the output of the inverter gate 126 does not match, that is, because the output is High, the drive circuit 129 causes the motor 20
Rotates in the feed / entry direction.

However, in the case of the control from wide to tele, since the wide position is slightly returned from the beginning, it is necessary to skip the first pulse. Therefore, OR gate 218
To set the flip-flop 208, and the AND gate is closed by the OR gate 209 and the inversion gate 210. Then, the end of the pulse at the wide position, that is, the signal that changes from L to H and then to L is changed from H to L and then to H by the inverting gate 214, the mono-multi 219 is activated at the rising edge of its clock (Raissing Clock), and the flip-flop 208 is activated. Reset.

After that, the pulse of the contact piece 30 is counted by the counter 11
Count at 7 and move to match. After the coincidence, as described above, the flip-flop 203 drives in the sinking direction for a certain time and stops.

The barrier is closed by operating the barrier switch 116, and after a short delay as in the opening, the line 125 is set to High, the gate 113 sets the indicated value (line 115) to zero, and the counter 117 becomes zero depending on the comparison output ( Switch 10
The sequence 147 is driven to the sinking direction by driving in the sinking direction (up to mono-multi output by turning on 8). Shutter release is performed by switches (SW2) and 130.

If the barrier open normal position (the comparison output of the comparator 119 coincides), the output of the AND gate 221 is set to High,
The output of the AND gate 131 becomes High, the sequencer 147 proceeds to Sequence F, and the line 222 becomes High.
h.

Reference numeral 132 denotes an EEPROM (offset value is written in the process), which has various offset values which differ depending on the lens barrel position of the line 118.

This value is initially set as a negative value to the counter 134 by the AND gate 133 in the sequence "wait", and the amount of extension is obtained from the AF device 135. 141 is a comparator.

The seqF late counter 134 is in the up mode,
Naturally, since the AF instruction value and the count value of the counter 134 do not match (the AF instruction value is large), the line 136 output (high right) is High and the line 137 (match) output Low.

Therefore, the output of the AND gate 139 is Hi.
GH becomes, and the feeding instruction is given through the OR gate 122, the output of the AND gate 140 is made High, and the output is driven through the OR gate 128.

However, since the drive is performed from the standby position as described above, the flip-flop 208 is set via the OR gate 218 and the AND gate 211 is closed and the counter 117 is operated from the standby position to the start position as described above. In addition, the AND gate 240 is closed by the inversion gate 230 at the same time, and the pulses of the rotation detector 102 from the start pulse are counted.

A negative offset value becomes a counting offset at the time of feeding, that is, when counting up. For example, if the AF distance measurement value is -10 or -5 depending on the lens, it is necessary to match 30 or 20 clocks. It will move to that point. This difference is used to adjust the lens position.

When it is fed out, the rotation pulse of the rotation detector 102 is counted up by the counter 134, and the value of the counter 134 is made equal to the value of the AF device 135 at the desired feeding amount. Then, the coincidence output of the comparator 141 sets the line 137 to High, and the sequence Rel is sent to the sequencer 147.
Instruct to move to.

The sequence Rel is the AE control unit 142.
Operation is started and exposure is performed. At the end, line 14
The output High of 3 causes a transition to the sequence RF.

The sequence RF can be driven because the output of the line 144 is High, and is driven in the retraction direction by the output Low of the AND gate 139. The movement counts the output of the rotation detector 102 with the counter 134 which changed into countdown. And gate 2 when reversing
Since the output of 41 is High, the flip-flop 203 is set via the OR gate 212. Therefore, while the AND gate 211 is closed, the inversion gate 214 waits for the pulse contact piece 30 to wait for the start position.

The delay circuit 216 indicates that the standby position has passed.
Of the input of L → H, and after delay, the line 217 is changed to Hi.
Set to gh and shift the sequence to "wait".

[0056]

As described above, according to the present invention, since the delay time is provided between the operation of the barrier operating knob and the start of the lens barrel extending operation, the following effects can be obtained. ..

(1) It is possible to prevent a malfunction from occurring due to a heavy load applied to the lens barrel when the operating knob is operated to apply a static pressure to the lens barrel to start the extending operation.

(2) Since the driving force of the motor for switching the focal length is not used to open and close the barrier, the interlocking mechanism for transmitting the driving force is unnecessary, and a compact and inexpensive camera can be realized.

(3) Since the driving force of the motor is used to open and close the barrier, the consumption of the battery can be prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a camera showing an embodiment of the present invention.

2 is a cross-sectional view of the camera shown in FIG.

FIG. 3 is an operation view of the lens barrel of FIG. 1 in a wide state as seen from the rear surface of the camera.

FIG. 4 is an operational view of the lens barrel of FIG. 1 in a telescopic state as seen from the rear surface of the camera

FIG. 5 is a diagram showing a relationship between the rear ball holder of FIG. 1 and a cam in a wide state.

6 is a diagram showing a relationship between the rear lens holder and the cam in a tele state shown in FIG.

7 is a block diagram of the barrier seen from the front of the camera of FIG.

8 is a perspective view showing a drive mechanism of the lens barrel of FIG.

FIG. 9 is a view for explaining the operation of the pulse plate of FIG.

FIG. 10 is a diagram showing a driving circuit of a camera.

[Explanation of symbols]

 1 ... Male helicoid 2 ... Female helicoid 3 ... Barrier operating ring 3a ... Operating knob 4, 5 ... Barrier 6 ... Rear lens holder 7 ... Shutter base plate

Continued front page (72) Inventor Akira Mingyuan Taichung Taiwan Tanzi Township Taichung processing exit Wak Jiangu Road Eighteen Eight 虀 Establishment Co., Ltd. Kogo Taichung Processing Depot, Jianguo Road, No. 18 Taiwan Taiwan

Claims (1)

Claims: 1. A knob for operating a barrier that is opened and closed on the front surface of the taking lens is provided on the front surface of the taking lens barrel, and the barrel is turned on by turning on the knob. In the camera, in which the camera body is extended and is turned off to perform a retraction operation, the camera has delay means for starting the extension or retraction operation of the lens barrel after a certain delay time has elapsed after the knob was turned on or off. A camera characterized by that.