JPH04264536A - Variable focal length camera - Google Patents

Abstract

PURPOSE:To provide the variable focal length camera which properly corrects parallax and gives a photographer no feeling of physical disorder even when only focal length information is obtained. CONSTITUTION:The variable focal length camera which measures a photographic distance by a range finding means 207 and performs focusing operation automatically according to the measured photographic distance is equipped with plural visual field frames 20 which are arranged in a finder optical system and correspond to photographic distances, an in-finder display means 205 which displays the visual field frames 20, and a control means which selects and displays the visual field frames 20 by driving the in-finder display means 205 according to range finding zone information and focal length information when the photographic distance is measured by a light measuring means 206. This control means displays the visual field frames by using range finding zone information on a nearly intermediate visual field frame 20 among the visual field frames 20 when only the focal length information is inputted to display the visual field frame which has small display variation even when a display pattern is determined.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable focal length camera that measures an object distance using a distance measuring means and automatically performs a focusing operation based on the measured object distance.

0002

2. Description of the Related Art In cameras other than single-lens reflex cameras, the optical axis of the photographing lens and the optical axis of the finder are misaligned, so that a so-called parallax occurs, which is a misalignment between the photographic screen and the viewfinder field of view. Therefore, in such a camera, it is necessary to perform parallax correction to change the position of the field frame visible in the finder so that the field of view to be photographed coincides with the photographic screen on the film.

On the other hand, there are autofocus cameras that measure the shooting distance from the photographing lens to the subject using a distance measuring device and automatically perform focusing operations based on this shooting distance. The demand for it has increased in recent years. Even in such an autofocus camera, if it is not a single-lens reflex camera, the above-mentioned parallax problem is multiplied, and in order to correct parallax, the field of view frame must be changed at the shooting distance to match the viewfinder's field of view with the shooting screen. There is a need to do so.

0004

[Problems to be Solved by the Invention] Conventionally, the structure of the viewfinder is extremely complicated due to the structure in which parallax correction is performed by mechanically moving the field frame. cannot be completely corrected,
It has been difficult to apply this method to a simple autofocus camera for general amateur use due to the size, weight, price, etc. of the camera.

For this reason, when the shooting distance is measured by, for example, a plurality of field frames corresponding to the shooting distance disposed in the finder optical system, a display means for displaying the field frames, and a distance measuring means, focusing zone information is displayed. , control means for selecting and displaying the field frame by driving the display means based on the focal length information, displays the field frame corresponding to the shooting distance, informs the photographer of this parallax correction, and selects and displays the field frame according to the shooting distance. It is conceivable to imprint the image using a corresponding field of view frame.

If parallax correction in the viewfinder is performed based on distance measurement zone information and focal length information in this way, for example, when the main switch of the camera is ON or after zooming until the release button switch S1 is pressed. Because distance measurement is not performed, parallax correction cannot be performed.

Therefore, as shown in (1) of FIG. 42, for example, there are cases where a photographer takes a picture at a far distance and then zooms to a close distance to take a close-up picture. The camera remains in the shooting state, and distance measurement is performed after the release button switch S1 is pressed, as shown in Fig. 42 (
Since the field of view is set at a short distance as shown in 2), the subject to be photographed may be missing, making it necessary to change the photographic composition again, and the change in the field of view may be large, giving the photographer a sense of discomfort.

[0008] The present invention has been made in view of the above circumstances, and even when only focal length information is available, it is possible to perform appropriate parallax correction without causing any discomfort to the photographer. The purpose is to provide a variable focal length camera.

[0009]

Means for Solving the Problems In order to solve the above problems, the invention according to claim 1 provides a photographic lens constituting a variable focus lens, a distance measuring means for detecting a subject distance by a photographing preparation operation, and a distance measuring means for detecting a subject distance by a photographing preparation operation. a distance measuring zone information output means for outputting distance measuring zone information based on the subject distance detected by the distance means; a focal length information detecting means for detecting focal length information of the photographing lens; and a zooming operation of the photographing lens. A photographing preparation operation is performed in a variable focus lens camera having a finder optical system that switches magnification in conjunction with each other, a plurality of field frames provided in the finder optical system, and a display means in the viewfinder that displays the field frames. In this case, the field frame selected based on the distance measurement zone information and the focal length information is displayed, and if only the focal length information can be obtained before the shooting preparation operation, the distance measurement zone information displays approximately the middle distance measurement zone. The present invention is characterized in that it includes a control means for displaying the field of view frame using information on the field of view.

[0010] The invention according to claim 2 provides a photographic lens constituting a variable focus lens, a distance measuring means for detecting a subject distance, and a distance measuring zone information is output based on the subject distance detected by the distance measuring means. A distance measurement zone information output means, a focal length information detection means for detecting the focal length of the photographic lens, a finder optical system that switches the magnification in conjunction with the zooming operation of the photographic lens, and a finder optical system provided in the finder optical system. A variable focus lens camera having a plurality of field frames and a finder display means for displaying the field frames; The present invention is characterized by comprising a control means for displaying a field frame corresponding to the most frequently used distance measurement zone at the focal length, based on the information stored in the storage means, when zone information cannot be obtained.

[0011] The invention according to claim 3 provides a photographic lens constituting a variable focus lens, a distance measuring means for detecting a subject distance, and a distance measuring zone information is output based on the subject distance detected by the distance measuring means. A distance measurement zone information output means, a focal length information detection means for detecting the focal length of the photographic lens, a finder optical system that switches the magnification in conjunction with the zooming operation of the photographic lens, and a finder optical system provided in the finder optical system. A variable focus lens camera having a plurality of field frames and a finder display means for displaying the field frames, comprising: a storage means for storing a distance measurement zone corresponding to the focal length according to a photographing operation; and a storage means for storing a distance measurement zone corresponding to the focal length; The camera is characterized by comprising display control means for displaying the field of view frame corresponding to the distance measurement zone at the focal length used in the previous photographing, based on the information stored in the storage means, when the information cannot be obtained. There is. The control means is characterized in that under the condition that only the focal length information is input, the control means selects and displays a field frame whose display changes less due to a change in focal length from among the plurality of field frames.

0012

[Operation] In the variable focal length camera according to the invention as claimed in claims 1 to 3, the distance measuring means measures the photographing distance, and the photographing is performed by automatically performing a focusing operation based on the measured photographing distance. . During this shooting, when the shooting distance is measured by the distance measuring means, the control means selects a predetermined field of view frame from a plurality of field frames corresponding to the shooting distance arranged in the finder optical system based on the distance measuring zone information and focal length information. Select to display the field of view frame. With this control means, under conditions where only focal length information is input, the field frame is displayed using distance measurement zone information approximately in the middle of the plurality of field frames, so that even if the display pattern is determined, the display does not change. Display fewer viewing frames.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 3 show a camera to which the present invention is applied; FIG. 1 is a front view of the camera, FIG. 2 is a rear view of the camera, FIG. 3 is a plan view, and FIG. 4 is a view showing the display in the finder. be.

Camera body A lens barrel 2 is provided at the center of the front part of the camera 1. A finder 3 and a distance measuring light projection window 4 are arranged above the lens barrel 2, and a strobe light is provided on the side of the finder 3. A distance measurement light receiving window 6 is arranged on the side of the window 5 and the distance measurement light projection window 4. Above the rangefinder floodlight window 4 and finder 3 is an LED display section 15.
The LED display section 15 is made to blink at a predetermined timing, for example, in sequence to notify the time at the time of self-photography. In addition, the LED in the direction corresponding to the distance measurement position of the distance measurement device
By lighting up the display unit 15, the direction of the moving target can be confirmed from outside the camera. Also,
A photometry section 16 is arranged above the lens barrel 2.

A large liquid crystal display section 7 is provided at the top of the camera 1, and is adapted to display a large amount of photographing-related information. Furthermore, a main switch 8 and a release button 9 are provided. During the initial stroke of pressing the release button 9, the switch S1 is turned on, and during subsequent strokes, the switch S2 is turned on.

[0016] The back cover constituting the back of the camera 1 is provided with a finder eyepiece window 10, a cartridge confirmation window 11, various switch buttons 12, and operation buttons 13. The operation button 13 moves the focal length of the zoom lens to the telephoto side by pressing the operation part 13a, and to the wide-angle side by pressing the operation part 13b. Further, by pressing the operating portion 13d, the direction of the moving target is changed to the left, and by pressing the operating portion 13c, the direction of the moving target is changed to the right. This operation button 13 is designed to perform two operations: a zooming operation and a moving target operation.

Photographic Lens An inner focus type zoom lens (varifocus lens) is used as the photographic lens. The lens configuration used is a four-group zoom lens. The zoom operation is an electric zoom drive method in which the zooming operation is automatically performed by pressing the operation button 13 described above.

Finder: A real image zoom finder is used. Display in the finder is performed by a display liquid crystal placed on the real image plane in the finder optical path, and a liquid crystal display method is used as shown in FIG. This figure 4 shows a state in which all segments are lit, and is a field frame for automatic parallax correction that automatically sets the field of view based on the focal length information of the photographing lens and the subject distance information detected by distance measurement operation. 20, a moving target mark 21 that lights up a position corresponding to the distance measurement position of a distance measurement device whose distance measurement position can be changed, a strobe light emission mark 22, a distance measurement display 23, a camera shake warning mark 24, etc. are displayed.

As a focusing distance measuring device, infrared light is projected from a light projecting element and irradiated onto a subject via a light projecting lens. 2. Description of the Related Art An infrared active type distance measuring device is used in which a light receiving element receives reflected light from a subject via a light receiving lens, and detects a distance to the subject based on the position on the light receiving element where the light is received. This distance measuring device is capable of changing the distance measuring position left and right with respect to the optical axis of the photographing lens, and this method is called a moving target method.

When the switch S1 of the first step of the release button 9 is turned on, the distance measuring device is activated to hold the distance measurement result, and this distance measurement result is displayed on the distance measurement display 23 in the finder. Further, if the distance is closer than a predetermined distance, a warning is displayed on the distance measurement display 23. When the switch S2 is turned on, the focus lens is driven to focus based on the distance measurement result. If the distance measurement result is closer than a predetermined distance, a release lock is activated to prohibit photographing operation.

The light receiving section of the exposure control photometry device is composed of a two-part silicon photodiode, and has a spot photometry element that measures the center of the photographic screen, and an average photometry element that measures the surrounding area other than the center. Based on the subject brightness information and film sensitivity information detected by these two photometric elements, exposure control suitable for the subject is performed.

Strobe The strobe device automatically stores the boosted current from the power supply in the capacitor upon completion of winding one frame of film, turns on the main switch, and presses the release button, and stops charging when the capacitor is charged to a predetermined voltage. The strobe firing selection modes include an automatic flash mode that determines whether or not the strobe will fire based on subject brightness information, a forced flash mode that fires the strobe regardless of subject brightness information, and a forced flash mode that fires the strobe regardless of subject brightness information. There is a non-light-emitting mode that does not work.

Film Feeding The film is fed by an autoloading method using a known motor as a driving source.Film feeding is started when the back cover is closed after loading the film, and four-frame blank feeding is performed. Also,
Film is fed using a spool drive system, and the number of frames is displayed on a counter using a forward counting system. Rewinding is performed automatically when the film is stretched during film feeding or when the completion of photographing the final frame is detected, or it can also be performed manually by operating a single switch.

Lens barrel structure FIG. 5 is a cross-sectional view of the photographic lens barrel, FIG. 6 is a partially cutaway side view of the photographic lens barrel, and FIG. 7 is a cross-sectional view of the mechanism for driving the photographic lens. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 5, FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 5, and FIG. 10 is a cross-sectional view taken along line X--X in FIG.

The lens barrel 2 has a cylindrical fixed barrel 40 fixed to the front side of the main body of the camera 1.
A plurality of sliding grooves 41 extending in a direction parallel to the lens optical axis α are formed on the inner peripheral surface of the lens. And this fixed lens barrel 4
A cylindrical front sliding frame 42 having a sliding protrusion 42a protruding on its outer circumferential surface that can move in the direction of the lens optical axis α along the sliding groove 41 is disposed inside the lens. A cylindrical movable lens barrel 43 is fixed.

Furthermore, the inner peripheral surface of the front sliding frame 42 also has a plurality of sliding grooves 4 extending in a direction parallel to the lens optical axis α.
4 is formed. Inside the front sliding frame 42, a rear sliding frame 45 is disposed, which has a sliding protrusion 45a projected on its outer circumferential surface that can move along the sliding groove 44 in the direction of the lens optical axis α. A fourth variable magnification lens group 46 consisting of three lenses is incorporated inside the rear side of the rear sliding frame 45, and this fourth variable magnification lens group 46 is screwed onto the inner periphery of the rear sliding frame 45. It is fixed with a ring screw 47.

Three lenses are attached to a partition wall 42b that partitions the inside of the front sliding frame 42, and the partition wall 42b
Two lenses are attached to the rear holder 48, which is placed opposite to the rear holder 48, and these five lenses constitute a third variable power lens group 49a. A spring 50 is provided between the rear side holder 48 and the rear sliding frame 45, and the rear sliding frame 45
The fourth variable magnification lens group 46 is always used as the third variable magnification lens group 49a.
It is biased in the direction away from. Two shutter blades 51 are interposed in the rear holder 48, and the shutter blades 51 are located between the third variable magnification lens group 49a.

A front holder 52 is attached inside the movable lens barrel 43, and a lens holder 53 is installed in front of the front holder 52 to fix the first variable magnification lens group 49b consisting of two lenses. It is screwed on. The first variable magnification lens group 49b and the third variable magnification lens group 49a constitute a first to third variable magnification lens system 49, which move together.

A guide groove 54 is formed inside the front holder 52 in the direction of the lens optical axis α.
is engaged with a protrusion 56a of a lens holder 56 into which a second variable magnification lens group 55 composed of three lenses is incorporated. The support portion 56b of the lens holder 56 is slidably provided on the sleeve 57. The sleeve 57 is slidably inserted into a guide pin 58 made of stainless steel and provided in the direction of the lens optical axis α, in close contact with the guide pin 58.
This eliminates lens wobbling and improves linearity. This guide pin 58 is attached to the front side holder 5.
2 and a plate 66 supported by the front sliding frame 42.

A coil spring 59 inserted into the guide pin 58 is provided between the support portion 56b of the lens holder 56 and the tip of the front side holder 52, and the coil spring 59 is inserted into the guide pin 58.
5 is always urged toward the third variable magnification lens group 49a. A screw shaft 62 is rotatably supported between a bearing 60 provided on the front side holder 52 and a bearing 61 provided on the partition wall portion 42b of the front sliding frame 42.
are parallel to the lens optical axis α direction. This screw shaft 6
A nut member 63 provided on the support portion 56b of the lens holder 56 is screwed onto the lens holder 56, and the second variable power lens group 55 can be moved in the direction of the lens optical axis α via the lens holder 56 by rotation of the screw shaft 52. It has become.

A small gear 64 is fixed to the screw shaft 62, and a large gear 65 is fixed to the shaft of this small gear 64. This large gear 65 meshes with a gear shaft 67 shown in FIG.
Drive pinion 7 of focusing motor 69 via 8
0, and the focusing motor 69 is driven to move the second variable magnification lens group 55 forward and backward in the direction of the lens optical axis α via a gear mechanism. On the other hand, a large gear 72 provided on a gear shaft 71 meshes with the small gear 64 of the screw shaft 62, and a gear 73a of the stopper member 73 engages with the gear shaft 71.
are engaged with each other, and the stopper part 73b is a stopper member 73 of a concave part 42c formed in the partition wall part 42b of the front sliding frame 42 in a fan shape around the axis of the stopper part 73b.
Rotation is restricted by contacting the end portion in the rotational direction, and movement of the second variable magnification lens group 55 is restricted. These gear mechanisms are supported between the plate 66 and the plate 75 on the partition wall 42b.

Rotating shaft 69a of focusing motor 69
is provided with three blades 76, and a photointerrupter 77 provided opposite to the three blades 76 obtains a pulse LDP1 by rotation of the focusing motor 69. Further, a large gear 78 is provided on the shaft of the gear shaft 71, and a small gear 81 of a rotating shaft 80 rotatably provided on the plate 79.
A single blade 82 is provided on the rotating shaft 80. A photointerrupter 83 is provided at a position facing this single blade 82, and a pulse LDP2 is obtained by rotation of the focusing motor 69.

The three blades 76 and the single blade 82 are made of polyacetal, which is a light-opaque resin. By forming it from polyacetal, it can be press-fitted onto the rotating shaft 69a of the motor with light pressure, and its position in the rotational direction can be easily adjusted after press-fitting.

As shown in FIG. 9, a cam barrel 90 is attached to the fixed barrel 40 so as to be rotatable around the fixed barrel 40, and a front sliding frame 42 and a movable barrel are mounted on the peripheral wall of the cam barrel 90. 43 in the direction of the lens optical axis α and a first correction cam groove 91 that corrects the amount of movement according to the change in magnification and the movement of the rear sliding frame 45 in the direction of the lens optical axis α and in accordance with the change in magnification. Second correction cam groove 9 for correcting the amount
2 is formed. A front cam pin 93 protruding from the outer peripheral surface of the front sliding frame 42 is attached to a lens optical axis formed on the peripheral wall of the fixed lens barrel 40 so as to be movable in the direction of the lens optical axis α according to the rotational movement of the cam barrel 90. It passes through a slot 94 parallel to α and projects into the first correction cam groove 91 . A rear cam pin 95 protruding from the outer peripheral surface of the rear sliding frame 45 is used to correct the difference between the amount of movement of the magnification adjustment lens of the finder 3 and the amount of movement of the front sliding frame 42 and the movable lens barrel 43. It passes through a slot 96 parallel to the lens optical axis α formed on the peripheral wall of the lens and an escape groove 97 of the front sliding frame 42 and projects into the second correction cam groove 92 .

A ring gear 98 is fixed to the outer peripheral surface of the cam barrel 90 near the base, and a drive pinion 100 of a zoom drive motor 99 fixed to the camera body is connected to the ring gear 98 via a reduction gear train 101. has been done. Therefore, when the zoom is operated, the ring gear 98 and the cam barrel 90 are rotated by the zoom drive motor 99 to the wide-angle side or the telephoto side depending on the direction of the operation, and the first to third variable magnification lens systems 49 are extended in the same direction. At the same time, the corrected position of the fourth variable magnification lens group 46 is automatically determined in accordance with the amount of extension of the first to third variable magnification lens systems 49.

Furthermore, a barrier 10 is provided inside the movable lens barrel 43.
3, and when the movable lens barrel 43 is moved from the wide-angle end position to the storage position, the barrier 103 is moved from the open state shown in the figure to the closed state shown by the two-dot chain line, and the photographing lens is protected in the storage state. Do this.

Lens Position Control Next, position control of an inner focus type lens (vari focus lens) will be explained in detail.

FIG. 11 shows the lens movement curve,
The horizontal axis shows the rotation angle of the zoom, and the vertical axis shows the distance from the focus plane. The 1-3rd variable magnification lens system 49 consists of a first variable magnification lens group 49b and a third variable magnification lens group 49a, which are connected and move together. The fourth variable magnification lens group 46 is located on the focal plane side, and is linked with the first to third variable magnification lens systems 49 by a zoom cam mechanism, and is extended while changing the distance between them.

The second variable power lens group 55 is located between the first variable power lens group 49b and the third variable power lens group 49a,
It is moved by a focusing motor 69 which is a focusing actuator, and is moved by changing the distance from the first to third variable magnification lens systems 49 or the fourth variable magnification lens group 46 . The zooming control of the fourth variable magnification lens group 46 has a rotation angle of 140 degrees from the wide-angle end to the telephoto end, and is controlled in 24 steps, with one step being set to approximately 6 degrees.

FIG. 12 is a zoom focus principle diagram,
This figure shows control of the focus lens of the second variable magnification lens group 55. As described above, the pulse LDP1 is obtained from the photointerrupter 77 that detects the rotation of the three blades 76, and this pulse LDP1 is used to maintain the accuracy of the focusing resolution, and also to correct the pulse, such as correction for each zoom, etc. used to make the final decision.

Pulse LDP2 is obtained from a photointerrupter 83 that detects the rotation of one blade 82, and this pulse LDP2 is used to determine the rough zoom zone to be moved by zooming, and is also used as a trigger pulse to start counting pulse LDP1. used as. This pulse L
DP2 becomes 1 when 54 pulses of pulse LDP1 are input.
It is designed to receive pulse input.

Stop positions for mechanically restricting movement of the focus lens are set on both sides, and the focus lens moves between these positions. In the stored state, the focus lens is stopped at the front stopper position. The focusing motor 69 is controlled by the pulse LDP1 and the pulse LDP2, thereby performing focusing. In the figure, movement to the left is motor reversal, and movement to the right is motor rotation. The positions of the focus lens indicated by solid lines are wide-angle infinity and telephoto infinity. The positions indicated by the broken lines are the wide angle of 0.8 m and the telephoto of 0.8 m, and the position indicated by the dashed line is the initial movement position of the focus lens, and is held at this position when the camera is in a shooting standby state.

Therefore, when the main switch is turned on,
The lens barrel in the stored state is zoomed to the wide end position, the focusing motor 69 is energized in the reverse direction, and the L
Count 5 pulses of DP2 and stop. At that time, the camera enters the wide shooting standby state from the stop position, which is the front end of the focusing lens. The focus lens now moves to the initial movement position for focusing shown by the dashed line, and when the lens barrel is in the wide position, the focus is controlled forward from this position. When zoom driving is performed and the focus lens is moved to the telephoto end, the focus lens is zoom-focused from the wide-angle initial movement position to the telephoto initial movement position. When photographing from this state, the focus is controlled forward. Since this embodiment uses an inner focus, the amount of movement of the focus lens differs between the telephoto side and the wide-angle side depending on the in-focus position for a finite distance. Further, if the focus lens is at a predetermined position on the wide-angle side, the position of the focus lens changes when moving to the telephoto side.

FIG. 13 is a diagram showing the principle of focus position correction. Inner focus requires focus position correction as shown in FIG. The subject distance is set on the horizontal axis from 0.8 m to infinity, and a numerical value for autofocus is set for this subject distance. The vertical axis shows the amount of lens extension, approximately 160 pulses on the wide-angle side and approximately 18 pulses on the telephoto side.
It is set to 0 pulse.

In this figure, the movement of the focus lens on the telephoto side is shown by a solid line, and the movement on the wide-angle side is shown by a chain line. According to this, even if the infinite position is set on the wide-angle side and the telephoto side, when focusing on a subject of 1.2 m, for example, the amount of extension is different between the telephoto side and the wide-angle side. On the wide-angle side, the aperture is controlled in a narrowed state, and especially on the short-distance side, the aperture is controlled to be further apertured to increase resolution.
Since the position of the peak resolution changes depending on the aperture value, the amount of extension of the focus lens when focusing at close range is supplemented.

[0046] Focus position correction is performed when the subject distance is 1.2 m or more.
Up to infinity, the drive pulse is set as P1 x AFZ/128, but when the subject distance is 0
．． In the range of 8m to 1.2m, telephoto side drive pulse 1
The amount of extension is corrected by P1+P2(AFZ-128)/64, and the amount of extension of the wide-angle side drive pulse is corrected by P1+P2(AFZ-128)/64+P3.

These pulse data are stored in the EEPROM for each of 24 zooming stop positions from the wide-angle side to the telephoto side. Infinite position is pulse L
Corrected by DP2 and shift pulse.

FIG. 14 is a diagram showing an encoder for controlling the zoom position, and FIG. 15 is a zoom switch timing chart. FIG. 14 shows an encoder consisting of a sliding resistance pattern and a sliding contact piece for obtaining signals for zoom control, and a zoom position signal is obtained by the sliding resistance pattern 300 and sliding contact piece 310. .

Sliding resistance pattern 300 and sliding contact piece 310
is provided in the part where the reduction gear train 101 that transmits the power of the zoom drive motor 99 to the cam barrel 90 is arranged, and the sliding contact piece 310 is fixed to the gear of the reduction gear train 101 to make it rotatable, and the sliding resistance The pattern 300 is placed on the camera body side, facing the sliding contact piece 310. Sliding contact piece 310
rotates as the lens is extended and slides on the sliding resistance pattern 300. The sliding resistance pattern 300 consists of a first pattern 301, a second pattern 302, a third pattern 303, and a fourth pattern 304 from the inner peripheral side, and the sliding contact piece 310 includes a first contact piece 311, a second contact piece 312, Third contact piece 3
13 and a fourth contact piece 314.

The fourth pattern 304 is composed of a sliding resistor, and its wide-angle side end is connected to GND and its telephoto side end is connected to 3V.
04, the first contact piece 311, and the fourth contact piece 314 obtain an analog voltage zoom position signal ZI as shown in FIG. This zoom position signal ZI is A/D converted and the zoom zone ZZ is obtained from a table stored in the EEPROM as shown in Table 1. In this table, a zoom correction value FZ and a photometry correction value AE are set according to the zoom zone ZZ.

Further, the second pattern 302 and the third pattern 303 form a digital pattern, and the second contact piece 312 and the third contact piece 313 generate a zoom close position signal ZC as shown in FIG. A zoom wide-angle end signal ZW, a zoom telephoto end signal ZT, and a digital zoom movement pulse signal ZP are obtained.

Therefore, when a zoom operation signal is input by operating the operation button 13, before the zoom operation to rotate the zoom drive motor 99, the zoom position signal ZI is A/D converted to the signal shown in Table 1 below. to obtain the zoom zone ZZ. This will give you the current position of the focus lens, but
When the zoom wide-angle end signal ZW or the zoom telephoto end signal ZT is input, the zone position [0],
Or obtain [23].

The zoom drive motor 99 is driven in response to the input of the zoom operation signal, and after the operation button 13 is released, is stopped at a predetermined position indicated by the zoom movement pulse signal ZP. The zoom position signal ZI obtained at this time is A/D converted to obtain a zoom zone ZZ. The difference between the focus zone FZ of the zoom zone ZZ obtained before the zoom operation and the focus zone FZ of the zoom zone ZZ obtained after the zoom operation is determined. The focus lens position is changed by zooming and focusing by the value obtained from this difference.

Table 1 ZI input table (a
), (b), (c), and (d) are timing charts of zooming operations. FIGS. 16(a) and 16(b) show timing charts when zooming up. FIG. 16(a) shows that when the zoom movement pulse signal ZP is OFF, when the zoom up signal ZU changes from ON to OFF by releasing the pressing operation on the operating part 13a of the operation button 13, the zoom movement pulse signal ZP turns OFF. At the timing when the zoom drive motor is turned ON, the power supply to the zoom drive motor is changed from forward power supply to reverse power supply, and is controlled to stop at the ON position between zoom movement pulse signals 3 and 4.

FIG. 16(b) shows that when the zoom movement pulse signal ZP is ON, by releasing the pressing operation on the operation part 13a of the operation button 13, the zoom up signal ZU is
goes from ON to OFF, the zoom movement pulse signal ZP
Wait for it to turn OFF, and at the timing when it turns from OFF to ON,
The zoom drive motor is controlled to be stopped at an ON position between zoom movement pulse signals 4 and 5 by changing from forward energization to reverse energization.

FIGS. 16(c) and 16(d) show timing charts when zooming down. FIG. 16(c) shows operation button 1 when zoom movement pulse signal ZP is OFF.
When the zoom down signal ZD changes from ON to OFF by releasing the pressing operation on the operation unit 13b of No. 3, the zoom drive motor energization changes from reverse energization to forward rotation energization at the timing when the zoom movement pulse signal ZP changes from OFF to ON. death,
At the timing when the next zoom movement pulse signal ZP changes from OFF to ON, the zoom drive motor energization is changed from forward energization to reverse energization, and the zoom movement pulse signal ZP is turned ON between zoom movement pulse signals 8 and 9.
Control the stop at the position.

FIG. 16(d) shows the zoom movement pulse signal Z.
When P is ON, by releasing the pressing operation on the operation part 13b of the operation button 13, the zoom down signal ZD is turned ON.
When it turns OFF, the zoom movement pulse signal ZP turns OFF.
Wait for F, and at the timing when it changes from OFF to ON, the zoom drive motor power supply changes from reverse power supply to forward power supply, and at the timing when the next zoom movement pulse signal ZP changes from OFF to ON, the zoom drive motor power supply changes from normal rotation power supply. The reverse energization is performed and the stop control is performed at the ON position between zoom movement pulse signals 7 and 8.

In this way, the zoom is stopped when the zoom up signal ZU or the zoom down signal ZD is used during normal rotation drive.
When the switch is input, the zoom movement pulse signal Z
When P changes from OFF to ON, it is immediately stopped. By using only the position from OFF to ON in this normal rotation operation, the accuracy of the zoom stop position can be improved.

Also, before stopping the zoom, it is determined that the switch of the zoom movement pulse signal ZP is in the OFF state,
The motor is controlled at the timing when it is turned on, thus eliminating chattering caused by controlling it in the ON state. This makes it possible to shorten the overrun of the zoom drive motor 99 during the chattering mask time, which allows absorption of movement speed dependence, temperature dependence, and individual differences in mechanical mechanisms. , the stopping accuracy of the zoom drive motor 99 is improved.

Furthermore, during reversal, the motor is driven to the forward rotation side before stopping, and then stopped. By performing this operation, backlash occurring in the mechanical mechanism can be absorbed, and the motor is driven to the forward rotation side. Since the stroke has at least the pulse width of the zoom movement pulse signal ZP, the stroke for driving the motor in the normal rotation side remains constant even if a voltage change occurs, and the motor stopping accuracy can be improved.

Furthermore, the brake is applied by reversely energizing the vehicle immediately before stopping, thereby shortening the overrun at the time of stopping, thereby making it possible to absorb temperature dependence. In addition, it is possible to absorb battery voltage dependence due to the same potential in forward and reverse directions. The time for igniting this reverse energization is controlled by the outside temperature, battery voltage, and individual difference information.

FIGS. 17(a) and 17(b) are similar to FIG. 16(b),
(d) is an auto zoom timing chart showing the movement of the lens in auto zoom mode, and moves the focal length to the telephoto side by two pulses based on subject distance information.The zoom movement pulse signal ZP is counted from OFF to ON and increases by 1. do. FIG. 17A shows an example of two pulses of movement toward the normal rotation side, and at the end of the count, a stop process is immediately performed in the same way as when zooming up.

FIG. 17(b) is an example of two-pulse movement in the reverse direction, and at the end of the count, wait for the zoom movement pulse signal ZP to turn OFF, as in the case of zooming down, and change from OFF to OFF.
At the timing when it becomes N, the zoom drive motor is energized from reverse energization to forward rotation, and the next zoom movement pulse signal ZP becomes O.
At the timing of switching from FF to ON, the zoom drive motor is changed from forward energization to reverse energization and stopped.

In this way, by rotating the reverse side also in the forward direction,
It is possible to perform the same stopping process as on the forward rotation side, and as described above, the zoom drive motor 99 is stopped immediately at the end of the pulse count without using a special chattering mask, so the process can be performed quickly with a constant process. can be stopped, and overrun can be reduced. Therefore, it is particularly suitable for automatic zooming, which automatically calculates the distance and changes the zooming amount according to the result.

FIG. 18 shows a focusing drive sequence. Focusing stop control is always in the direction of moving the focus lens forward, that is, focusing motor 6
It operates and stops on the normal rotation side of 9. The focusing motor 69 is driven and focused, and counting of pulses LDP1 is started using the fall of the first pulse LDP2 as a trigger, and when the aforementioned predetermined pulse is input, stop control of the focusing motor 69 is started.

A short brake is applied to the focusing motor 69, constant voltage reverse energization is performed for reverse A time t1, and constant voltage forward energization is performed. The short brake is applied again, constant voltage reverse energization is performed for reverse B time t2, and constant voltage forward energization is performed. moreover,
Constant voltage reverse energization is performed for a reverse C time t3, and finally it is stopped for a predetermined time.

The reverse A time t1 depends on the number of control pulses. As shown in FIG. 13, this control pulse depends on the distance measurement result, and the pulse LDP1, which is set as the motor rotation amount commensurate with the target rotation control amount, depends on the shift pulse to produce an infinite position. The setting of this control pulse differs between the telephoto side and the wide-angle side, and is set for each zoom zone ZZ. The reverse A time t1 becomes longer when there are many control pulses, and becomes shorter when there are fewer control pulses, and the reverse B time t2 and reverse C time t
3 sets the brake time according to the moving speed of the focus lens, performs stop control according to the moving speed of the focus lens, can always stop with a constant overrun, and furthermore reduces overrun.

In this way, the reverse A time t1 is set, for example, as shown in Table 2, depending on the control pulse.

Table 2 Calculation of (t1) Also, the reverse B time t2 is the short brake time, the reverse A time t1 for constant voltage reverse energization, and the constant voltage, for example, 14 pulses input during the time for constant voltage forward energization. It is set depending on the operating time of (PA). Further, the reverse C time t3 is set depending on the short brake time, the reverse B time t2 for performing constant voltage reverse energization, and the operation time of a constant, for example, 8 pulses (PB) input at the time for constant voltage forward energization. be done. This reverse B time t2,
The reverse C time t3 is as shown in Table 3, for example.

Table 3 Calculation of (t2) and (t3) In addition, the short braking time before reverse A time t1 and reverse B time t2 should be extremely short, for example, 200 μsec, so as not to adversely affect the motor. time C
The subsequent braking time is set constant, for example, 200 msec, and the short brake is used to stop the focusing motor 69 in a shorter time.

In this way, the microcomputer 200
is a stopping means that stops the focusing motor 69 by repeatedly applying reverse energization and forward energization brakes, and determines the next brake energization time based on the time required to energize the focusing motor 69 for a predetermined amount of movement using the reverse energization and forward energization brakes. It has a control means for setting, and can perform braking according to the moving speed of the focus lens, making it possible to keep the amount of overrun constant, and stopping the focus lens in a short time and with high precision. can be done. Further, the reverse A time t1, the reverse B time t2, and the reverse C time t3 are corrected based on temperature, power supply voltage, and individual difference information.

Shutter Structure As shown in FIGS. 5 and 6, the shutter structure includes a photo interrupter 102 provided in the rear holder 48 to detect the operation of the shutter blade 51, and cutouts 51b to 51e formed in the shutter blade 51. 1st to 5th with the tip part 51f
The trigger signal is obtained.

As shown in FIG. 10, the shutter blade 51 is
It is driven by the operation of an operating pin 84,
The operating pin 84 is fixed to a lever 86 provided on a rotating shaft 85, and teeth 86a formed on the lever 86 mesh with a drive pinion 88 of a shutter drive motor 87 constituted by a DC motor. The actuation pin 84 is actuated via the lever 86 by the drive of the shutter drive motor 87, and the pair of shutter blades 51 are opened and closed. The shutter blades 51 each have a protrusion 89 on the front sliding frame 42.
The opening/closing operation is performed by pushing the base portion 51a of the operating pin 84.

Shutter Driving Device Next, the shutter driving device of this camera will be explained in detail. FIG. 19 is an AE program diagram showing exposure control when using film with ISO sensitivity 100. Exposure control is performed using two elements: shutter speed and aperture, with the horizontal axis representing the shutter speed and the aperture representing the vertical axis. After the film sensitivity is determined and the subject brightness is measured, the EV value, which is the appropriate exposure value, is determined, and the shutter speed and aperture are set to reach that EV value. With this program control, the linked range is EV value 3 to EV value 18. be. Since this camera has zoom control, when the focal length changes, the effective F value changes, and F3.5 is obtained when the wide-angle side is fully opened, and F8.5 is obtained when the telephoto side is fully opened. F on the wide-angle side
Since the required resolution cannot be obtained with 3.5, I use F3.8 and do not open it fully at the wide-angle end.

Furthermore, since this camera cannot measure the EV value of 18 or more due to the ability of the photometer, the EV value of 18 or more cannot be measured at the telephoto end.
8, the exposure is controlled at a shutter speed of about 1/300, but if a film with an ISO sensitivity of 400 is used, exposure can be controlled at a shutter speed of 1/500. Furthermore, the range in which strobe light emission control is linked on the telephoto side and wide-angle side is shown by double lines.

FIGS. 20(a) to 20(d) are diagrams showing the principle of automatic exposure correction. FIG. 20(a) shows the exposure control of the standard shutter, and FIG. 20(b) shows the operation of the shutter blade 51. 20(c) shows exposure control for a standard shutter, and FIG. 20(d) shows exposure control when the shutter blade 51 is slow.
Exposure control is shown when the operation is slow.

In FIG. 20(a), the shutter drive motor 87, which is a DC motor that drives the shutter blade 51 in response to the release operation, is reversely energized for a predetermined time t1 to eliminate mechanical backlash and push the shutter spring toward the closing side. The shutter blade 51 is moved to the contact position, is energized at a high voltage for a predetermined time t2 to drive the shutter blade 51 in the opening direction, and is thereafter energized at a low voltage for a predetermined time t3 to open the shutter blade 51. Then, at the falling edge of the trigger signal ST output when a predetermined aperture diaphragm is obtained by operating the shutter blade 51, the shutter drive motor 87 is reversely energized for a predetermined time t4, and the shutter blade 51 is
1 in the closing direction and stop. The opening area of the shutter blade 51 increases exponentially in accordance with the amount of rotation of the shutter drive motor 87, and when a predetermined delay time t5 elapses from reverse energization, the shutter blade 51 closes and a predetermined exposure amount cannot be obtained. can.

By the way, as shown in FIG. 20(b),
For example, if the increase in the rotational speed of the shutter drive motor 87 is slow, the operation of the shutter blade 51 is slowed down, so the output of the trigger signal ST is slowed down, and an error occurs in the exposure amount accordingly.

Therefore, as shown in FIGS. 20(c) and 20(d), there is a means for applying a high voltage and a low voltage to the shutter drive motor 87 when the shutter is opened, and a means for applying a high voltage and a low voltage to the shutter drive motor 87 in synchronization with the opening operation of the shutter blade 51. A means for obtaining a plurality of trigger signals is provided, and after the opening operation from the initial fully closed position by the first trigger signal ST0, electricity is applied at the high voltage until the opening start point until the generation of the second trigger signal ST1. After the starting point, the device is provided with means for applying current at a lower voltage after the starting point. shutter blade 51
A specific configuration of the means for obtaining a plurality of trigger signals in synchronization with the opening operation is shown in FIG. 10, and is adapted to obtain first to fifth trigger signals ST.

As a result, as shown in FIG. 20(c), for example, when the shutter blade 51 operates normally, the output time of the first trigger signal ST0 is short, and the output time of the first trigger signal ST0 is correspondingly high. The energization time t2 is short. By the way, as shown in FIG. 20(d), for example, if the shutter blade 51 operates slowly, the output time of the first trigger signal ST0 becomes longer, and the output time of the first trigger signal ST0 increases. The current is applied at a low voltage for a predetermined time t3 until the high voltage energization time t2 becomes longer and the second trigger signal ST1 reversely energizes. In this way, the shutter drive motor 87
By changing the energization time t2 of the high voltage applied to
A uniform amount of exposure can be obtained. Therefore, it is possible to absorb variations in load due to individual differences in the weight of the shutter blade 51, etc., and to eliminate the influence of environmental factors such as temperature, etc., and it is possible to obtain a highly accurate exposure amount.

Furthermore, the energization time at a high voltage can be automatically set according to the output of the first trigger signal ST0 obtained in synchronization with the opening operation of the shutter blade 51. It is possible to correct the exposure amount by applying a high voltage corresponding to the shutter opening operation without using the shutter opening operation.

FIG. 21 shows details of exposure amount correction, and FIG.
The solid line 1 represents the exposure amount of the standard shutter in FIG. 20(c),
The broken line indicates the exposure amount when the shutter blade 51 operates slowly in FIG. 20(d). According to the output of the first trigger signal ST0, the high voltage energization time t2 of the DC motor is automatically adjusted, and the low voltage is energized at the fall of the first trigger signal ST0, and the second trigger signal ST0 is energized. Signal ST1
Reverse current is applied at the falling edge of .

That is, when the load on the shutter drive motor 87 is large due to the exposure control by the shutter blade 51, the operating speed of the shutter blade 51 is slow, and the speed (d) in FIG.
) The shutter blade 5 in FIG. 20(c) is indicated by a solid line.
Although the slope of the exposure amount characteristic curve is gentler both in rising and falling than in the case of exposure control according to No. 1, the exposure amount is corrected to be approximately the same by lengthening the energization time t2 at a high voltage.

FIGS. 22(a) to 22(f) show the shutter blade 5.
1 is shown in the operating state. (a) of FIG. 22 shows the state when the motor is started, and the first trigger signal ST0 is output, but the shutter drive motor 87 is not rotating and the first trigger signal ST0 is output. A high voltage is applied to the shutter drive motor 87, thereby driving the shutter drive motor 87. In FIG. 22(b), the shutter drive motor 87 rotates approximately 70 degrees, and the lever 86 is actuated to cause the shutter blade 51 to rotate.
is activated, the second trigger signal ST1 is output, and the state immediately before the shutter opens is reached. In FIG. 22(c), the shutter blade 51 is further operated to output a third trigger signal ST2, and this trigger signal ST2 is used as a trigger to control the shutter blade 51 to stop, and the aperture is set to F5.6. In FIG. 22(d), the shutter blade 51 is further operated to output a fourth trigger signal ST3, and this trigger signal S
The shutter blade 51 is controlled to stop using T3 as a trigger, and the aperture is set to F3.8.

In (e) of 22, the fifth trigger signal ST4
is output, and using this trigger signal ST4 as a trigger, the shutter blade 51 is stopped and an open aperture is formed.
The aperture shown in FIG. 22(f) is obtained. By controlling the stop of the shutter blade 51 when the shutter blade 51 is fully open, it is possible to prevent the shutter blade 51 from bouncing when the shutter blade 51 is fully open, thereby reducing the mechanical overstroke of the shutter blade 51 from the fully open position to absorb the bounce. can do. When the shutter blade 51 is fully opened, the shaft of the shutter drive motor 87 rotates about one revolution. The shutter drive motor 87 shown in this embodiment does not reach the saturation speed within about one rotation after starting, and the shutter opening operation depends on the starting characteristics of the motor. Therefore, it can be used in areas with high responsiveness in forward and reverse rotations.

FIGS. 23(a) to 23(d) show the shutter drive sequence, FIG. 24(a) shows the energizing time table, FIG. 24(b) shows the braking time table, and FIG. The aperture characteristics of the shutter blade 51 are shown. Figure 23(a) shows control when the shutter speed is high;
9 shows the shutter drive in regions A1 and A2 where the aperture value and shutter speed on the telephoto side and wide-angle side of No. 9 change. (b) in Figure 23
) shows the shutter drive in region B where the aperture value is constant at a short distance on the wide-angle side and the shutter speed changes, and (c
) shows the shutter drive in region C where the aperture value is constant at a long distance on the wide-angle side and the shutter speed changes. (d in Figure 23)
) shows shutter drive in region D where the aperture value is constant when fully open on the telephoto side and the shutter speed changes.

The shutter drive motor 87 is shown in FIG. 20(a).
As shown in ~(d), it is driven by a trigger signal ST output by the shutter blade 51. The shutter drive motor 87 is energized with a high voltage from the start of shutter driving, and at the fall of the first trigger signal ST0, is energized with a low voltage and switched to perform an opening operation. The exposure amount control table energization time t6 of the positive voltage applied to the shutter drive motor 87 is stored, for example, in a table 1 as shown in FIG. 24(a).

In FIG. 23(a), the second trigger signal ST
23(b) indicates the falling edge of the third trigger signal ST2, FIG. 23(c) indicates the falling edge of the fourth trigger signal ST3, and FIG. 23(d) indicates the falling edge of the fourth trigger signal ST3. Exposure control is performed using the fall of the trigger signal ST4 of No. 5 as a trigger. In FIG. 23(a), using the falling edge of the second trigger signal ST1 as a trigger signal, reverse energization is performed for a predetermined time t7 after the time indicated in Table 2 has elapsed, and then for a predetermined time t8.
The aperture characteristic X1 of the shutter blade is braked and has a triangular waveform as shown in FIG. 25.

In (b) to (d) of FIG. 23, stop control is performed, and the trigger signals ST are counted, and the adjustment is performed at the falling edge of the third, fourth, and fifth trigger signals ST2, ST3, and ST4. The current is reversely energized for a time t9, braking is performed for a predetermined time t10, the current is reversely energized for a predetermined time t11, and the braking is performed again for a predetermined time t12, thereby obtaining the aperture characteristics X2, X3, and X4 of the shutter blade 51 having a trapezoidal waveform as shown in FIG.

The adjustment time t9 for reverse energization at the falling edge of the third, fourth, and fifth trigger signals is written in a storage means such as an EEROM, and the adjustment time t9 differs for each F value. Further, for the predetermined time t10 of braking to be performed after the adjustment time t9, a table 2 stored in a memory in advance, as shown in FIG. 24(b), for example, is used, and this table 2 is A shifted table of exposure times is used to simplify the information.

Furthermore, the first trigger signal ST0 shown in FIGS. 23(a) to 23(d) is used as the light emission timing for strobe control, and interrupt control is performed from this first trigger signal ST0 to cause strobe light emission. It is done. In addition, the strobe light emission timing is determined by, for example, the second, third, fourth, and fifth trigger signals ST1 in (a) to (d) of FIG.
, ST2, ST3, and ST4. The shutter drive sequence shown in FIGS. 23(a) to 23(d) and the aperture characteristics X1, X2, X3 of the shutter blades shown in FIG. 24,
As shown by X4, the triangular waveform is controlled by the time from the first trigger signal ST0, and the trapezoidal waveform is controlled by subsequent trigger signals, thereby controlling the exposure amount.

A means for obtaining a trigger signal ST corresponding to the aperture value in synchronization with the opening operation of the shutter blade 51, and a means for detecting the trigger signal ST generated when the shutter is opened as aperture value information to stop driving the shutter drive motor 87. and means for controlling the shutter blade 51 to close and stop the shutter blade 51 after a predetermined period of time after the shutter drive motor 87 of the DC motor is stopped. Therefore, by driving the shutter drive motor 87, trigger signals ST1, ST2, ST3, S are generated while the shutter is opening.
T4 is detected as aperture value information, and the shutter drive motor 8
7 is stopped to form an aperture, and after a predetermined time, reverse current is applied to control the closing of the shutter blades.

By controlling the triangular waveform with the time from this first trigger signal ST0, Table 1 in which time is stored is created.
23 (b) and (c), even if the F value of the aperture increases, the time can be set according to the F value, so the size of Table 1 can be reduced. can do. Furthermore, by controlling the triangular waveform according to the time from the first trigger signal ST0, and controlling the trapezoidal waveform according to the braking or reverse energization time using subsequent trigger signals, exposure-priority or aperture-priority program control can be performed. Moreover, exposure accuracy can be improved.

Further, the stop control of the shutter blade 51 is shown in FIG.
In order to accurately and stably stop the shutter blade 51, a braking effect is provided by changing the adjustment time and the energizing voltage. 26(a) shows the reverse energization adjustment times t14 and t15 changed, and FIG. 26(b) shows the reverse energization voltage E1 lowered. Moreover, in (c) of FIG. 26, the voltage E2 of the first reverse energization is made high, and the voltage E3 of the second reverse energization is made low. In other words, large variations may occur depending on the acceleration when performing sudden braking, but 2
By lowering the voltage E3 of the second reverse energization, gentle stop control can be performed.

Distance measurement and photometry device The distance measurement device of the camera has a variable distance measurement point, and the distance measurement direction can be changed stepwise from side to side by pressing an operation button. Further, the photometry device is also integrated with the distance measurement device and is adapted to change the photometry direction. FIG. 27 is a plan view of the distance measuring and photometric device, and FIG. 28 is a sectional view taken along line AA' of the distance measuring and photometric device.

A distance measuring light emitting section 501, a distance measuring light receiving section 502, and a photometering section 503 are provided close to the front cover 500 of the camera, and each is attached to a distance measuring base 504.

This ranging base 504 is inserted into a support shaft 506 provided on a moving target base 505 fixedly held on the main body, and is rotatable in left and right directions about this support shaft 506 as a fulcrum. The directions of the distance measuring light emitting section 501, the distance measuring light receiving section 502, and the photometry section 503 are now changed. A position regulating spring 507 is provided on the support shaft 506, one end 507a of which is connected to a stopper 508 fixed to the moving target base 505, and the other end 507
b is locked to the distance measuring base 504, and this position regulating spring 5
07 suppresses play in the circumferential direction and the axial direction of the support shaft 506.

A connecting pin 509 is provided on the ranging base 504, and this connecting pin 509 is engaged with a recess 510a of an adjustment plate 510. The adjustment plate 510 is fixed to the drum 511, and when the drum 511 rotates in the left-right direction about the support shaft 524, the distance measuring base 504 is rotated by a predetermined angle in conjunction with the drum 511. A long hole 510b is formed in the adjustment plate 510 in the circumferential direction around the support shaft 524 of the drum 511. A pin 511f of the drum 511 is inserted into this long hole 510b, and the positional relationship is adjusted with an eccentric pin 511g. The distance measurement position can be adjusted by changing the mounting position during assembly.

An operating groove 5 is provided at the opposite position of the drum 511.
11a and 511b are formed in two stages, and this operating groove 51
1a, 511b, moving target base 50
A feeding claw 513 is rotatably mounted on a shaft provided at both ends 512a, 512b of a moving target lever 512, which is rotatably provided on a support shaft 523 of No.5.
514, and fixed claws 517 rotatably provided on the support shafts 515, 516 of the moving target base 505.
518 is engaged. Moving target lever 512
When one of them is pressed, the other feed claw 513, 5
14 releases the engagement with the working grooves 511a, 511b and retreats, and the rising portions 517b of the fixing claws 517, 518
, 518b, and the fixed claw is also released and retracted from the working groove.

[0100] The fixing claws 517, 518 are formed with downward stopper portions 517a, 518a on the drum side, and upward rising portions 517b, 518b on the non-drum side. The support shafts 515, 516 are provided with springs 519, 520, and one end portions 519a, 520a of the springs 519, 520 are fixed claws 517, 520a.
518, the other end portions 519b, 520b are engaged with stoppers 521, 522 provided on the moving target base 505, and urge the fixed claws 517, 518 to always engage with the working grooves 511a, 511b of the drum 511. ing.

The moving target lever 512 is rotatably mounted on a support shaft 523 of the moving target base 505. A return spring 528 is attached to the mounting shaft portion 550 screwed onto the support shaft 523, and both ends 528a of the return spring 528 are connected to stoppers formed on the shaft portion 551c of the mounting shaft portion 551 screwed onto the support shaft 524. Part 5
51d, and the moving target lever 512 is always urged to return to the initial position via the stopper portion 512c.

A recess 511e is formed on the outer periphery of the drum 511, and a center click plate 526 is formed in this recess 511e.
The spring portion 526a of is adapted to engage with the spring portion 526a. Center click board 526 is moving target base 505
This center click plate 526 is fixed with screws 527 to
Due to this action, the drum 511 is held at the initial position, and the distance measuring light emitting section 501, the distance measuring light receiving section 502, and the photometering section 503 are at the center position where they do not rotate.

On the other hand, a return spring 5 is attached to the shaft of the drum 511.
25 is attached, and both ends 525a of this return spring 525
is engaged with the shaft portion of the moving target lever 512, and the drum 511 is always urged to return to the initial position by the return spring 528 via the stopper portion 511c.

Feed claws 513 and 514 rotatably biased toward the drum 511 by springs 519 and 520 at both ends of the moving target lever 512 move the drum 511 as the moving target lever 512 rotates in the left and right direction.
The drum 511 is rotated one stage at a time by engaging with the working grooves 511a and 511b. Fixed claws 517 and 518 are located below the feeding claws 513 and 514.

The moving target lever 512 is rotated in the left-right direction using the operation button 13 about the support shaft 523, and the rotation of the moving target lever 512 causes the feeding claws 513, 514 in the rotating direction to move into the action grooves 511a, 511a of the drum 511. 511b and is pushed. Now, the drum 511 rotates, and the fixed claws 517, 51 in the rotating direction
8 engages with the next working groove 511a, 511b of the drum 511, and moves the drum 511 to the next working groove 511a, 511b.
Rotate for a minute and hold. At this time, the feeding claws 513 and 514 in the non-rotational direction are rotated by the rotation of the moving target lever 512, and the rising portions 517b and 517b of the fixed claws 517 and 518 are rotated.
518b, and the fixed claws 517, 518 are connected to the spring 519.
, 520 and rotates in a non-rotating direction.
, 511b, and the drum 511 is made rotatable. When the moving target lever 512 returns to the initial position, the fixed claws 517, 518 move to the feed claws 513,
Since the locking at 514 is released, the working groove 511 of the next stage
a, 511b to restrict rotation of the drum 511.

[0106] There are protrusions 13e and 1 on the top and bottom of the operation button 13.
Mounting portions 13g and 13h are provided on the left and right sides of 3f, and are used for two operations: zooming operation and moving target operation. That is, by pressing the operating portion 13a of the operating button 13, the protrusion 13e presses the contact portion 552a of the switch 552 formed of elastic conductive rubber provided on the moving target base 505, and is connected to the control portion on the main body side. The connected pattern of the flexible printed circuit board is made conductive, and the focal length of the zoom lens is moved to the telephoto side.

On the other hand, by pressing the operating portion 13b of the operating button 13, the protrusion 13f presses the contact portion 552b to bring the pattern of the flexible printed circuit board connected to the control portion on the main body into a conductive state. Move the focal length of the zoom lens to the wide-angle side. In addition, by pressing the operation part 13d of the operation button 13, the mounting part 13h
The left side of the moving target lever 512 is pushed, the drum 511 is rotated to the right via the feed pawl 514, and the distance measurement base 504 is rotated to the left to change the distance measurement and photometry directions.

By pressing the operating part 13c of the operating button 13, the right side of the moving target lever 512 is pushed by the mounting part 13g, contrary to the above, and the feed claw 5
13, the drum 511 rotates to the left, and the distance measurement base 504 rotates to the right, changing the distance measurement and photometry directions to the right.

[0109] Pin 529 provided on this drum 511
The recess 530a of the position detection lever 530 is engaged with the
This position detection lever 530 is rotatably provided on a support shaft 531, and when the position detection lever 530 is rotated, a contact piece 532 slides on a pattern (not shown) to output rotation information of the drum 511 and perform distance measurement control. The position information of the ranging base 504 is obtained at .

A release lever 533 is also rotatably provided on the support shaft 531, and a contact piece 53 is attached to the release lever 533.
4 is provided and is operated in conjunction with the operation of a main switch 8 which can take two positions by clicking. A shaft portion 533a provided on the release lever 533 engages with a recess 535a of a release plate 535 rotatably provided on the shaft portion 511c of the drum 511, and when the release lever 533 is operated, the release plate 535 is rotated. Rotate counterclockwise.

[0111] Therefore, when the main switch 8 is turned off, the release lever 533 is rotated clockwise by operating the main switch 8. Now, when the release plate 535 rotates counterclockwise, its actuating parts 535b, 535c come into contact with the stoppers 517a, 518a of the fixed claws 517, 518 and are pushed. Therefore, the fixed claws 517, 518 are supported by the springs 519, 520 with the support shafts 515, 516 as fulcrums.
The drum 511 is rotated in a direction away from the working grooves 511a and 511b against the force. As a result, the position restriction of the drum 511 is released, so that the drum 511 is moved by the return spring 5.
25, the drum 511 returns to its initial position at the center.
The click portion 526a of the center click plate 526 engages with the recess 511e of the center click plate 526, and is held at this initial position. Therefore, whenever the main switch 8 is turned off, the moving target is automatically returned to the center position, and preparations for the next photographing can be made without any special operation.

Distance Measurement Control Next, the moving target information set will be explained. FIG. 29 shows a schematic diagram of obtaining moving target information from the distance measuring device shown in FIGS. 27 and 28. Figure 2
The distance measuring base 504 is rotated by the rotation of the drum 511 shown in 7.
When the contact piece 532 of the position detection lever 530 is connected to the patterns 0 to 4 in FIG. 29, the analog voltage MVI is obtained according to the patterns 0 to 4. This analog voltage MVI is A/D converted, and this A/D
The ranging direction position information MVZ is determined from the value.

In this embodiment, the ranging direction position information MVZ
When is 0, it is 6.6 degrees to the left, when MVZ is 1, it is 3.3 degrees to the left,
When MVZ is 2, it is in the center, when MVZ is 3, it is 3.3 degrees to the right.
When MVZ is 4, it can be detected that the deflection angle of the range finder is 6.6 degrees to the right.

From this ranging direction position information MVZ and focal length information ZZ, moving target position information MV is selected from the moving target table shown in Table 4.

Table 4 Based on the selected moving target position information MV, one of the 1 to 13 LCDs from the left in the viewfinder display in FIG. 4 is selected and turned on.

[0116] By displaying the information in the finder in this manner, it is possible to easily confirm from the outside which position is being measured. In this embodiment, the deflection angle of the distance measuring device can be switched in two steps to the left and right around the optical axis of the photographic lens, and by moving the photographic lens optical system during zooming, the deflection angle other than the center of the optical axis can be At corners, there is a discrepancy between the moving target frame display in the finder and the distance measurement point of the rangefinder. This deviation occurs because the magnification in the finder changes as the focal length changes due to zooming, but the deflection angle of the rangefinder does not change. By changing the distance measurement point, the display of the moving target mark 21 can be made to correspond to the display of the moving target mark 21, thereby eliminating changes in the distance measurement range at telephoto and wide angle.

Furthermore, the information set for parallax correction will be explained. Parallax correction is to correct the mismatch between the photographing range of the photographic lens and the viewfinder, and an example of this parallax correction will be described below.

[0118] First, a case where both distance measurement zone information and focal length information are obtained will be described. (1) to (3) in Figure 30
) shows the display in the viewfinder of the embodiment with three types of field frame display patterns, and the display state of parallax, which controls the field of view by blinking the field frames 20a and 20b, is determined based on the object distance information X. Obtain distance zone information AFZ, and use this distance measurement zone information AFZ and focal length information ZZ.
is selected from the parallax correction table shown in Table-5.

Table 5 That is, when the distance measurement zone information AFZ is 0 to 63, the correction shown in (1) in FIG. 30 is performed regardless of the focal length information ZZ, and when the distance measurement zone information AFZ is 64 to 127. In this case, if the focal length information ZZ is on the telephoto side, the correction shown in (2) in FIG.
In the case of , when the focal length information ZZ is 8 to 15, FIG.
0 (2) correction is performed and the focal length information ZZ is 16
In the case of .about.23, the correction of (3) in FIG. 30 is performed.

[0120] In this way, a plurality of field frames 20a corresponding to the photographing distance and focal length are arranged in the finder optical system.
20b, a display means in the finder for displaying the optical field frames 20a and 20b, and a control means for driving the display means in the finder from the focusing zone information AFZ and the focal length information ZZ. ON
), the distance measuring means is activated to detect the subject distance information X, the distance measuring zone information AFZ is obtained from this subject distance information Select one of the display patterns shown in the parallax correction table -5.

However, when the switch S1 is OFF and no photographing preparation operation is performed, only the focal length information ZZ is input. For example, when the focal length information ZZ is 0 to
If the focal length information ZZ is 8 to 15, the field frame (1) in FIG. 30 is selected.
is selected, and when the focal length information ZZ is 16 to 23, the field frame (2) in FIG. 30 is selected. That is, when distance measurement zone information AFZ cannot be obtained, by displaying distance measurement zone information approximately in the middle of all distance measurement zones,
Even if the shooting preparation operation (switch S1 is turned ON) and the display pattern is determined, the plurality of field frames (1) to (3)
) is designed to display a field of view frame with little change in display.

[0122] Also, as a condition in which only the focal length information ZZ is input, for example, when the main switch is turned on, or when the release button switch S1 is pressed after zooming,
There is a period of time until the button is pressed.

Further, as another embodiment, as shown in FIG. 31, it is possible to display an intermediate field frame among a plurality of field frames (1) to (5). This field of view frame (1
) to (5) are selected from the parallax correction table in Table-6. That is, in this embodiment, the focal length information ZZ is 0.
~7, select field frame (2) and enter focal length information Z
When Z is 8 to 15, field frame (3) is selected, and when focal length information ZZ is 16 to 23, field frame (4) is selected. In this case, when the main switch is OFF, the field frame (2) is selected when the focal length information ZZ is between 0 and 7. This embodiment is carried out on liquid crystal displays A and D in FIG.
0 and the moving target mark 21 are displayed.

Table 6 In addition, as another embodiment, a storage means such as an E2PROM that can rewrite information is provided, and the number of times the distance measurement zone corresponding to the focal length is used is stored based on the shooting operation, and the distance measurement zone information is stored. If this cannot be obtained, the field frame corresponding to the most frequently used focusing zone for each focal length is displayed based on the stored information in the storage means, and the most frequently used focusing zone for each focal length is displayed based on the stored information. It can be configured to select a field frame corresponding to a high photographing distance and perform parallax correction.

For example, if a plurality of field frames (1) to (5) as shown in FIG. 31 are used, and an image is taken as shown in Table 7, the focal length information ZZ is 0 to 7. If the field frame (1) is selected and the focal length information ZZ is 8
-15, field frame (4) is selected, and when focal length information ZZ is 16-23, field frame (3) is selected. This embodiment is carried out on liquid crystal displays A and D in FIG.
0 and the moving target mark 21 are displayed.

Table 7 Furthermore, as another embodiment, a memory means in which information can be rewritten is provided, and information on the photographing distance at the previous focal length is stored, and a field frame is selected based on this stored information. It can be configured to perform parallax correction.

For example, when there are a plurality of field frames (1) to (5) as shown in FIG. 31, the focal length information ZZ is 0.
In the case of ~7, when shooting with the field of view frame (3) displayed,
When the focal length information ZZ becomes 16 to 23 during zooming,
Select the field of view frame (5). This embodiment is carried out on a liquid crystal display D in FIG. 38, which includes a field frame 20 for parallax correction and a moving target mark 2.
1 is displayed.

[0128] As another embodiment, it is possible to configure the camera to minimize changes in the field of view frame due to zooming. For example, when having multiple field frames (1) to (5) as shown in FIG. 31, the focal length information ZZ is 0.
In the case of ~7, when shooting with the field of view frame (3) displayed,
When the focal length information ZZ becomes 16 to 23 during zooming,
Select the field of view frame (3).

[0129] When the focal length information ZZ is 0 to 7, when the field frame (1) is displayed and photographed, when the focal length information ZZ becomes 16 to 23 during zooming, the field frame (3) is displayed.
Select. This embodiment is carried out on a liquid crystal display D in FIG. 38, on which a field frame 20 for parallax correction and a moving target mark 21 are displayed.

Further, as an embodiment, it is possible to perform distance measurement immediately before, at the end of, or during zooming, and to select a field frame based on the distance measurement information. This example is carried out in FIGS. 39-41.

FIG. 32 shows that by varying the ranging direction,
The refraction angle of distance measurement light that passes through the dustproof panel surface changes, and a method for correcting distance measurement errors due to this change is shown. A dust-proof panel 600 is provided in front of the distance-measuring device to protect the distance-measuring unit and the like, and the dust-proof panel 600 is fixed to the camera case and does not move when the distance-measuring point changes. Therefore, as shown in FIG.
The refraction of the distance measuring light projected from 1 to the subject 602 when passing through the dustproof panel 600 changes depending on the deflection angle α in the distance measuring direction. Due to this, an error x occurs on the PSD distance measurement surface of the light-receiving light element 604 via the AF lens 603, and accurate distance measurement results cannot be obtained.

For this reason, as shown in FIG. 31, changes in the error x depending on the deflection angles θ and α are determined in advance and stored in a table as described below.

Here, t' is determined by the distance between the optical axis and the AF lens.

Next, the refraction angle θ' of the dustproof panel 600 is determined. Here, n is the refractive index of the dustproof panel 600, for example, approximately n
= about 1.5.

[0135] Error x due to refraction of this dustproof panel 600
0 is found by

Further, the distance x1 between the distance measuring light refracted by the dustproof panel 600 and the distance measuring light not refracted is calculated as follows.

[0137] Therefore, the error x of the light receiving element 604 on the PSD distance measurement surface is obtained as follows.

In this way, means for obtaining position information in the ranging direction and means for correcting the ranging information based on the position information in the ranging direction are provided. By correcting the distance measurement information from the stored table, it is possible to eliminate distance measurement errors caused by changes in the refraction of the distance measurement light that passes through the dustproof panel depending on the deflection angle in the distance measurement direction, allowing accurate measurement. Get the distance result. The luminous flux of the light emitted from the distance measuring device is also refracted by the dustproof panel 600, but this correction can be made by adjusting the moving target mark 21 in the finder in advance by the amount of deviation of the luminous flux caused by the refraction.

Photometry Control Next, photometry control will be explained. FIG. 33 is a timing chart of photometry. As shown in FIG. 33, this photometry control is performed by controlling the spot/average photometry switching signal S/A, the measurement start command signal CA, the measurement start signal CB, and the measurement stop signal AEI, and the spot time SPT of the output of the photometry IC is and find the average time AVT.

In this photometry control, spot photometry is performed when the spot/average photometry switching signal S/A is at L level, and average photometry is performed when it is at H level. When the operation of the routine before the photometry routine is completed, the photometry routine starts, and after a predetermined time to stabilize the power supply voltage, the measurement start signal CB becomes H level, and the capacitor set to the reference voltage is discharged for a predetermined time. conduct,
After this time has elapsed, the measurement start command signal CA is set to H level, the timer T is activated, and the charging time of the capacitor changes depending on the amount of light received by the photometric element for spot photometry. By reaching the voltage, the measurement stop signal AEI becomes H level, and the spot photometry time SPT is measured by the number of loops of the timer T during this time.

Next, the spot/average photometry switching signal S/A is set to H level, and after a predetermined time to stabilize the power supply voltage, the measurement start signal CB is set to H level, and the capacitor set to the reference voltage is set to H level. After discharging for a predetermined period of time, when the measurement start command signal CA goes to H level, the timer T is activated and the charging time of the capacitor changes depending on the amount of light received by the photometric element for average photometry. By starting charging and detecting that the reference voltage has been reached, the measurement stop signal AEI is set to H level, and the average time AVT is measured by the number of loops of the timer T during this period.

Next, photometric calculation correction will be explained. Spot photometry time SPT and average photometry time AVT are proportional to brightness, and the longer each time is, the darker it will be.
If it is short, it is determined that it is bright, and this photometric characteristic is shown in the graph of FIG. 34 for average photometric time AVT, for example.

In FIG. 34, for ease of calculation, the vertical axis is EVAV, which is the value obtained by multiplying the EV value calculated from the number of loops of timer T by five, and the horizontal axis is the average photometry time AVT. The relationship can be shown by the standard characteristic shown by the solid line.

By the way, if, for example, variations in the external resistors and capacitors of the photometric IC can lead to error characteristics as shown by the dashed-dotted line or the dashed-double-dotted line, by matching these error characteristics to the standard characteristics, Photometric calculation correction is performed.

[0145] However, photometric correction to match this error characteristic to the standard characteristic requires a hardware correction such as installing a resistor for correction, which increases the number of parts, is difficult to automate, and requires a lot of adjustment man-hours. There are some problems.

By the way, the average photometry time A in FIG.
Since the relationship between VT and the number of loops of timer T is shown in the graph, the error characteristics can be matched to the standard characteristics by selecting the loop time of timer T for measuring the average photometry time AVT. .

That is, in order to measure the average time AVT, a timer is run for 248 μsec in one loop as a standard, and the measurement is performed by the number of loops that the timer T runs during the average photometry time AVT. For this reason, for example, a timer with one loop of 232 μsec is selected for the error characteristic indicated by the dashed-dotted line in FIG. 34, and a timer of 264 μsec is selected for the error characteristic indicated by the dashed-double line in FIG.

[0148] As a result, EVAV and timer T in Fig. 36
It is possible to match the control characteristics as shown in the graph of the relationship between the number of loops. This photometry control is performed using a table that provides the control characteristics shown in FIG. 36, and this control characteristic is calculated from the photometry time AVT to the average photometry value
I'm looking for.

EVAV=EVSFT-number of loops of timer T Here, EVSFT indicates the shift amount and E
This is for shifting and adjusting vertical deviations from standard characteristics using data (0 to 127) in the EPROM. Further, the timer T is determined by the data EVLEN in the EEPROM as shown in Table 8.

Table 8 Therefore, by selecting EVLEN, it is possible to correct the error in the slope characteristic, and by selecting EVSFT, it is possible to correct the error in the vertical shift characteristic. For example, as shown in FIG.
As shown in Figure 4, if the error characteristic is as shown by the one-dot chain line, the timer T232μsec in FIG. to correct.

In this way, even if the average photometry time AVT deviates from the standard photometry characteristics, it can be changed by changing the loop time of timer T to match the standard photometry characteristics without making any hardware adjustments. , so that standard photometric characteristics can be obtained.

[0152] Also, the error in the slope characteristic is corrected by selecting the EVLEN data stored in the memory, and the EVSFT
Correcting the error in the vertical shift characteristics by selecting data, Figure 3
Since the photometric characteristics of 6 are obtained, only one photometric correction table is required, which has the advantage of reducing memory capacity and processing time.

Camera Circuit Configuration FIG. 37 is a schematic block diagram of the camera. This camera uses a microcomputer 200 and a battery 201.
The driving voltage is given from A storage means 202 in which information can be written is connected to the microcomputer 200,
Further, various switches and peripheral devices are connected to this microcomputer 200. As various switches,
There are a main switch 8, a moving switch 203 operated by the operation button 13, a tele side contact piece 204a and a wide side contact piece 204b of the zoom switch 204, which are also activated by the operation button 13, and a switch S1 and a switch S2 of the release button 9. , peripheral devices include a funder display means 205, a photometry means 206, a distance measurement means 207, a zoom control means 208, a lens barrel position detection means 209, a lens control means 210, a lens position detection means 211, a shutter control means 212, and a feeder. There is a sending means 213 and the like.

FIG. 38 shows an operation flowchart of the camera, and parallax correction is performed based on FIG. 31. When the input of the main switch 8 is determined in step 1-a and the main switch 8 is turned on, the zoom control means 208 zooms and moves to the wide position (step 1-b), and the viewfinder display means 205 is driven. Then, the visual field frame 20 with little change and the moving target mark 21 are displayed on the liquid crystal display A (step 1-c). Then, when the input state of the main switch 8 is determined and it is turned off (step 1-d), it zooms and moves to the close position (step 1-e).
, similarly displays on the liquid crystal display A, and proceeds to step 1-a (step 1-f).

In step 1-d, if the main switch 8 is in the ON state, the input state of the zoom switch 204 is determined (step 1-g), and the zoom switch 204 is turned on.
When turned on, the zoom control means 208 performs a zoom operation (step 1-h). Zoom switch 204 is OFF
When this happens (step 1-i), the visual field frame 20 and the moving target mark 21, which do not change much, are displayed on the liquid crystal display D (step 1-j), and a predetermined time is set on the timer (step 1-k). , zoom switch 204 is O
When the result is N (step 1-l), the process moves to step 1-h and a zoom operation is performed.

[0156] Then, in step 1-l, when the time set by the timer elapses without the zoom switch 204 being turned on (step 1-m), the focus lens is moved (step 1-n). -d
Move to. If the zoom switch 204 is OFF in step 1-g, the switch S1 of the release button 9 is OFF.
When N is selected (switch 1-o), the photometry means 206 performs photometry (step 1-p), the distance measurement means 207 performs distance measurement (step 1-q), and the distance measurement information is stored (step 1-p).
r) Furthermore, on the LCD display B in the finder, a field frame 20 and a moving target mark 21 are displayed based on distance measurement zone information AFZ and focal length information ZZ, and a strobe light emission mark 22, a distance measurement display 23, and a camera shake warning mark 2 are displayed.
4 (step 1-s), and the input of the switch S2 of the release button 9 is determined (switch 1-t). If the switch S2 is not input, the viewing frame 20 and the moving target mark 21 of the liquid crystal display B are continued to be displayed on the liquid crystal display C (step 1-u), and the process moves to step d.

In step 1-t, when the switch S2 of the release button 9 is input, the lens control means 210 performs focusing (step 1-v), and the shutter control means 212 controls opening and closing of the shutter. (Step 1-w) When the exposure is completed, the feeding means 213 carries out film feeding for winding the film (Step 1-w).
x), a liquid crystal display C is performed (step 1-u), and the process moves to step 1-d.

FIG. 39 shows an operation flowchart of another embodiment of the camera. In this embodiment, distance measurement is performed immediately before zooming and parallax correction is performed, and the other operations are similar to the embodiment shown in FIG. 38. That is, steps 2-a to 2-
The operations up to step g are the same as steps 1-a to 1-g in FIG. 38, and when the zoom switch 204 is turned on in step 2-g, distance measurement is performed (step 2-y) and a zoom operation is performed. (Step 2-h). Steps 2-i to 2-n are steps 1-i in FIG.
~ It operates in the same manner as in step 1-n to move the focusing lens, and then proceeds to step 2-d. When the zoom switch 204 is OFF in step 2-g, when the switch S1 of the release button 9 is turned ON (switch 2-o), photometry (step 2-p) and distance measurement are performed (
Step 2-q), further display the liquid crystal display B in the viewfinder (Step 2-s), and then proceed to Steps 2-t to 2-x.
At this point, the same operations as 1-t to 1-x in FIG. 38 are performed.

FIG. 40 shows an operation flowchart of still another embodiment of the camera. In this embodiment, distance measurement is performed after zooming is completed and parallax correction is performed, and the other operations are the same as in the embodiment shown in FIG. That is, step 3-
Steps a to 3-g operate in the same manner as steps 1-a to 1-g in FIG. 38, and when the zoom switch 204 is turned on in step 3-g, a zoom operation is performed (step 3-h). When the zoom switch 204 is turned off (step 3-i), distance measurement is performed (step 3-y), a display is performed on the liquid crystal display D (step 3-j), and step 3
-k to step 3-n are from step 1-k in FIG.
It operates in the same manner as step 1-n to move the focusing lens, and then proceeds to step 3-d.

[0160] If the zoom switch 204 is OFF in step 3-g, the switch S1 of the release button 9 is OFF.
When N is selected (switch 3-o), photometry (step 3-p)
), performs distance measurement (step 3-q), displays liquid crystal display B in the viewfinder (step 3-s), and in steps 3-t to 3-x, displays 1-t to 1-x in FIG. A similar operation takes place.

FIG. 41 shows an operation flowchart of still another embodiment of the camera. In this embodiment, distance measurement is performed during zooming to perform parallax correction, and the other operations are similar to the embodiment shown in FIG. That is, step 4-a
- 4-g operate in the same manner as steps 1-a to 1-g in FIG. 38, and in step 4-g, the zoom switch 2
When 04 is turned on, zoom operation is performed (step 4
-h), distance measurement is performed during this zooming operation (step 4-y), and display is performed on the liquid crystal display D (step 4-i).
). When the zoom switch 204 is turned off (step 4)
-j), steps 4-k to 4-n are shown in FIG.
The focusing lens is operated in the same manner as steps 1-k to 1-n, and the focusing lens is moved, and the process proceeds to step 4-d.

[0162] In step 4-g, the zoom switch is turned off.
In this case, when the release button switch S1 is turned on (switch 4-o), photometry (step 4-p), distance measurement (step 4-q), and LCD display B in the viewfinder are performed. (Step 4-s), Step 4-
The same operation as 1-t to 1-x in FIG. 38 is performed from t to 4-x.

[0163]

[Effects of the Invention] As described above, under conditions where only focal length information is input, the variable focal length camera of the present invention selects a field frame whose display changes less due to a change in focal length from among a plurality of field frames. For example, even if the main switch of the camera is ON or distance measurement is not performed after zooming until the release button switch S1 is pressed, appropriate parallax correction can be performed and the shooting This prevents the need to change the photographic composition again due to missing parts of the desired subject, and prevents the photographer from feeling uncomfortable.

[Brief explanation of the drawing]

FIG. 1 is a front view of a camera.

FIG. 2 is a rear view of the camera.

FIG. 3 is a plan view of the camera.

FIG. 4 is a diagram showing a viewfinder display.

FIG. 5 is a sectional view of a photographic lens barrel.

FIG. 6 is a partially cutaway side view of the photographic lens barrel.

FIG. 7 is a sectional view of a mechanism for driving a photographic lens.

FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 5;

9 is a sectional view taken along line IX-IX in FIG. 5. FIG.

FIG. 10 is a cross-sectional view taken along the line X-X in FIG. 5, showing signal detection means for shutter blade control;

FIG. 11 is a diagram showing a lens movement curve.

FIG. 12 is a zoom focus principle diagram.

FIG. 13 is a diagram showing the principle of focus position correction.

FIG. 14 is a diagram showing an encoder for zoom position control.

FIG. 15 is a zoom switch timing chart.

FIGS. 16(a) to 16(d) are timing charts of zooming operations.

17A and 17B are diagrams showing lens movement in the auto zoom mode of FIGS. 16B and 16D; FIGS.

FIG. 18 is a diagram showing a focusing drive sequence.

FIG. 19 is an AE program diagram.

FIGS. 20(a) to 20(d) are diagrams showing the principle of automatic exposure correction.

FIG. 21 is a diagram showing details of exposure amount correction.

FIGS. 22(a) to 22(f) are diagrams showing operating states of the shutter blades.

FIGS. 23(a) to 23(d) are diagrams showing a shutter drive sequence.

FIG. 24(a) is a diagram showing an energization time table, and FIG. 24(b) is a diagram showing a braking time table.

FIG. 25 is a diagram showing the aperture characteristics of the shutter blade.

FIGS. 26(a) to 26(c) are diagrams showing shutter blade stop control.

FIG. 27 is a plan view of the distance measurement and photometry device.

28 is a sectional view taken along line AA′ of the distance measuring and photometric device shown in FIG. 27. FIG.

FIG. 29 is a schematic diagram of obtaining moving target information from the distance measuring device shown in FIGS. 27 and 28. FIG.

FIGS. 30(1) to 30(3) are diagrams showing field frames in the finder.

FIG. 31 is a diagram showing parallax correction.

FIG. 32 is a diagram showing a structure for correcting distance measurement information by varying the distance measurement direction.

FIG. 33 is a timing chart of photometry.

FIG. 34 is a diagram showing average photometric characteristics.

FIG. 35 is a diagram showing the relationship between average photometry time AVT and the number of loops of timer T.

FIG. 36 is a diagram showing the relationship between EVAV and the number of loops of timer T.

FIG. 37 is a schematic circuit block diagram of the camera.

FIG. 38 is an operation flowchart of the camera.

FIG. 39 is another operation flowchart of the camera.

FIG. 40 is another operation flowchart of the camera.

FIG. 41 is another operation flowchart of the camera.

FIG. 42 is a diagram showing conventional parallax correction.

[Explanation of symbols]

2 Lens barrel 3 Finder 8 Main switch 9 Release button 13 Operation button 20 Field of view frame 21 Moving target mark 200 Microcomputer 205 Display means in finder 206 Photometering means 207 Distance measurement means

Claims (3)

[Claims] 1. A photographing lens constituting a variable focus lens, a distance measuring means for detecting a subject distance by a photographing preparation operation, and a distance measuring means for outputting distance measuring zone information based on the subject distance detected by the distance measuring means. a zone information output means, a focal length information detection means for detecting focal length information of the photographic lens, a finder optical system that switches magnification in conjunction with a variable magnification operation of the photographic lens, and a plurality of viewfinder optical systems provided in the finder optical system. In a variable focus lens camera having a field of view frame and a display means in the finder for displaying the field frame, when a shooting preparation operation is performed, the field frame selected based on the distance measurement zone information and the focal length information is displayed. display,
The variable variable display apparatus further comprises a control means for displaying the field of view frame using information of a substantially intermediate distance measurement zone as distance measurement zone information when only the focal length information is obtained before the photographing preparation operation. focal length camera. 2. A photographic lens constituting a variable focus lens, a distance measuring means for detecting a subject distance, and a distance measuring zone information outputting means for outputting distance measuring zone information based on the subject distance detected by the distance measuring means. a focal length information detection means for detecting the focal length of the photographic lens; a finder optical system that switches magnification in conjunction with the zooming operation of the photographic lens; and a plurality of field frames provided in the finder optical system; A variable focus lens camera having a finder display means for displaying the field frame, and a storage means for storing the number of times a distance measurement zone corresponding to the focal length is used based on a photographing operation, and distance measurement zone information cannot be obtained. A variable focal length camera characterized in that the variable focal length camera comprises a control means for displaying a field frame corresponding to a distance measurement zone that is used most frequently at the focal length, based on information stored in the storage means. 3. A photographing lens constituting a variable focus lens, a distance measuring means for detecting a subject distance, and a distance measuring zone information outputting means for outputting distance measuring zone information based on the subject distance detected by the distance measuring means. a focal length information detection means for detecting the focal length of the photographic lens; a finder optical system that switches magnification in conjunction with the zooming operation of the photographic lens; and a plurality of field frames provided in the finder optical system; A variable focus lens camera having a finder display means for displaying the field frame, a storage means for storing a distance measurement zone corresponding to the focal length according to a photographing operation, and a case where the distance measurement zone information is not obtained. The variable focal length camera is characterized by comprising display control means for displaying the field of view frame corresponding to the distance measurement zone at the focal length used for previous photographing, based on stored information in the storage means.