JPS59191020A - Automatic focusing camera - Google Patents

Abstract

PURPOSE:To realize a close-up, and also to prevent an out-of-focus by inhibiting a release operation when a distance to an object to be photographed exceeds a focal range by a photographic lens set to a close-up position. CONSTITUTION:When a usual photographing of a camera is set and an object to be photographed is at the closest focusing point (d), a light is made incident to only a photodetector 108d, only an output D4 of a comparator 114 is at a high level, an output of a gate 132 is at a low level, and even if a switch 103 is turned on by depressing a release button, a gate 135 does not go to a high level, and a release signal B is not outputted. When a close-up photographic state is set and the object is at the closest focusing point (d), the light of a projecting element 105 is reflected, made incident to the photodetector 108d, and only the output D4 is at a high level, the output of the gate 132 is at a high level, and when the switch 103 is turned on, the release signal B is outputted. When the object to be photographed is positioned except the point (d), an output A0 of a gate 127 is at a low level, and even if the switch 103 is turned on by two low inputs of the gate 132, the gate 135 does not output the release signal B.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an autofocus camera having a close-up function.

[Background of the invention]

By extending the main lens that makes up the short focal length lens forward, it is possible to place the Hatake 1 lens behind the main lens, which allows the focal length of the photographic lens to be divided into two types: short focal length and long focal length. Cameras that can be switched to are well known.

Furthermore, in such cameras, it is also known to extend the main lens by a predetermined amount to enable close-up photography without positioning the sub-lens behind the main lens.

By the way, such a camera does not have an autofocus device (
When incorporating an AF parent device (hereinafter described as an AF parent device), if the AF parent device is activated to perform focusing of the photographic lens during close-up photography, it is necessary to configure the camera so that the photographic lens is extended largely by the AP' device. Inconveniences arise in terms of the space involved in extending the lens and the cost of the extending mechanism.

For this reason, conventionally, when such a camera is used for close-up photography, the photographing lens is fixed at a predetermined position without activating the AF parent device, and the bin 1 is covered by the depth of field of the photographing lens. was considered. However, with this method, even if the camera is set to close-up mode and the photographer accidentally releases the camera to take a picture of a distant subject, the camera will continue to perform the exposure operation. Therefore, there was a risk that an out-of-focus photograph would be taken.The present invention was created in view of these circumstances.The purpose of the present invention is to set the camera in a close-up state and place the photographic lens in a predetermined position. Even when the camera stops at 1, the distance to the subject is detected by the AF device, and if the distance to the subject exceeds the range that can be focused by the shooting lens set at the close-up position, the camera automatically detects the distance to the subject. An object of the present invention is to provide an autofocus camera that allows close-up photography and eliminates the risk of taking out-of-focus photographs by prohibiting the release operation of the camera.

[Description of preferred embodiment]

Figure 1 (8, (BJ, tQ) is a sectional view showing an embodiment of a variable focus camera to which the present invention can be applied; Figure 1 (Al) is a standard photographing state of such a camera; B1 shows the telephoto shooting state, and Fig. 1 (0) shows the close-up shooting state.

In the figure 1. Main lens 1 that constitutes a short focal length lens
is held in the lens barrel 2. A sub-lens 3, which constitutes a long focal length lens by being located behind the main lens 1, is held by an extender 4.A lens-barrel bar 5 is fixed to the lens-barrel 2, and the lens-barrel bar 5 is held together with the cover unit 6 at two places and is slidable. The extender 4 is rotatable with the extender bar 7, which is held at both ends held by the cover unit 6, in the middle.

Reference numeral 8 denotes a support bar, which is fixed to the cover unit 6, slides between retaining plates 90, and is held intermittently at 9 at two places.In addition, 1o is a guide bar, which ( is fully fixed at both ends by a retaining plate 9, and the cover unit 6 is slidably fitted to the guide bar 10.Therefore, the cover unit 6 (is used as a guide for this guide bar 10-i). 11 is an infinite adjustment screw that is screwed into the lens barrel 2 and can be rotated around the photographing optical axis when fitted to the cover unit 6. When the rotating ring 16, which is pressed against the face cam portion of the rotating ring 16 and is biased in that direction by the presser spring 17, is rotated by means not shown, the lens barrel 2 is extended. A bellows J3 is arranged between the control cover unit h6 and the light shielding plate 12. Also, 14θ is the camera body, 15 is a sprocket, 18 is a shutter, and j9 is a camera case. .

There is a click mechanism (not shown) between the camera body 4 and the cover unit 6, so that the cover unit 6 can be set to the standard photographing position for humans in Figure 1, the telephoto photographing position in Figure 1(B), and the telephoto position in Figure 1(B). It is fixed at three positions of the close-up photographing position q, and can be switched to each position by pulling out or pushing in the cup unit 6 by hand.

When the cover unit 6 is pulled out from the standard photographing state shown in FIG. 1 (Δ), it is first identified by a knock at the position of the close-up photographing state shown in FIG. 1 [C]. cover unit 6
Even if the extender 4 is pulled out to this position, the extender 4 remains in the position shown in FIG. Only the main lens 1 is extended forward, making it possible to take close-up shots.

When the cover Unisol l-61i is further pulled out from the 1st position, the extender 4 is rotated around the center by means not shown, and the 1st
As shown in figure (B), the 10-element axis of the king lens and the element 1 of the sub-lens 3
Till I matched Ichitachi [Hama ni Ichichusadasa Sairu. After that, the cover unit 6 changed to a click mechanism.
FIG. 2 shows the automatic zoom force/r in the variable focus camera Ca configured as described above, which is fixed at the position of the shadow.

Reference numeral 60 denotes a seven-stroke lever that moves to the right in FIG. 2 in conjunction with the film winding operation by a mechanism not shown. In this state, when the release button (not shown) is pressed, the first stroke of the release button energizes the magnet 64 and attracts the stop claw 62. With the second stroke of the release button, the set lever 60 is tightened or released via a release magnet (not shown), and the set lever 60 is moved to the left in Fig. 2 by a spring (not shown). The rotary ring 16 is rotated counterclockwise by the spring 61 to move the main lens 1 toward infinity.After this, the magnet 64 is energized based on the distance measurement value from the distance measurement circuit, which will be described later. If you are stopped,
The stop pawl 62 is moved counterclockwise by the spring 65 and engages with a portion 63a of the ratchet 63 provided on the rotary ring 16 that corresponds to the distance measurement signal from the distance measurement circuit, thereby stopping the ring 16'z. and center the main lens 1 at a position corresponding to the subject distance. Also, 70 is camera C
When a is set to the close-up state of FIG. 1 (q), the stomper moves from the position shown by the solid line to the position shown by the dashed line, and stops the rotating ring at a predetermined position. FIG. 3 shows the present invention. This is a circuit diagram showing an embodiment of the present invention. In this figure, lot is a power battery, and 102 is a switch that is turned on in response to the first stroke of a release button (not shown).
When this switch 102 is turned on, power supply to the entire circuit is started, and the light emitting element 105 lights up.

103 is a switch that is turned on in response to the second stroke of the release button; 104 is a switch that is turned on when the camera Ca is set to the state shown in Figure 1 (8 or (■); This switch is turned off when set to .

Further, 106 is a light projecting lens that collects the light from the light projecting element 105 and guides it toward the subject, and 107 is a light receiving V lens that collects the reflected light from the original subject. When located at each of the points ad, the reflected light is guided to each of the light receiving elements 108a to 108d as shown. ill~114 is a comparator, and each inverting input terminal has a semi-fixed resistor 109 and a resistor 11.
A reference voltage divided by J is connected to 0, and the outputs of the light receiving elements 108a to 108d are connected to each non-inverting input terminal, so that when reflected light is incident on each light receiving element 108a=d, The output is set to be level 7. For example, when the object is at point C (the output of the r-1 comparator 113 becomes cool), the object is located between points a and b, and the reflected light is guided to the light-receiving elements 108a and 108l. The outputs of comparators 111, 112, and D2 are set to be at the no level when the motor is hit.

Note that point d indicates a very close point where it is impossible to align the pin 1-ff depending on the movement of the main lens 1 when the camera is set to the "A4-state" shown in Figure 1. In addition, point a is the far point, point A is the midpoint, and point C is the near point, and when the camera Ca is set to the state of W (BJ) in Figure 1, it is halfway between points C and d. It is possible to adjust the focus from the position to infinity.

115-120 are inverters, 121-127 are AN
In the D gate, the AND gates 121 to 127 and the comparators 111 to 114 are connected to each of the gates 113 and 113.
If the output of '-114 is R,'-D4, and the outputs of AND gates 121 to 127 are A6 to A0, then the inverters 115 to 120' (connected as shown in the figure so that the following logical formula holds true) ing.

AO=D, -D4. , A,=D:1
-D4A,, = D2- D3・D4, A
3=102・D.

A, -101・D2-top, , A, -ri, -D.

A, = D,・Fusa Also, 128 is a 7-person OR gate, AND gate 1
The respective outputs A and -Ao of 21 to 127 are connected, and the output is inverted via an inverter 129 and then output as A7. This output A7 is generated because the subject is far away from point a and no reflected light enters each light receiving element 108a=d, and the outputs AI of 1.21 to 127, ~A,
When all of the objects are at low level, the nine objects are at zero and low levels, indicating that they are at infinity. The output A7 can be expressed as a logical expression as follows.

Ay-Ao + A I+ A 2 + A 3+ A
4 + A 5 + As also A, N D ter 1-
Resistance 130 for Soldown for 121 to 126 single power
are connected, and when the switch 104 is off, the outputs of the AND gates 121-126 are held at a low level regardless of the outputs of the regulators 111-114. Further, the outputs A1 to A7 are sent to a lens control circuit (not shown) through a launch circuit (not shown), and are sent to a lens feeding mechanism (not shown) in the second drawing.

133 is a launch circuit fl for latching the output AO of the A, ND gate 127 when it becomes too low.
B, 132 is a latch circuit] EXCLUST VI-OR connected to 33 and the aforementioned pull-run resistor
Kate 1. Its output is OR gate 134, A, N
Connected to D gate 135. A clock pulse C is manually applied to the OR gate 134, and its changing force is connected to the light emitting diode 137 via a resistor 136. Also, the AND gate 135's -manual power e is used for pull-down. When the output of the EXeLtJS IVE-OR gate is at a high level and the swing-103 is turned on by the second stroke of the release button, the switch 103 shown in FIG. A release button B is output to start the movement of O to the left in the drawing via a magnet (not shown).

To explain the operation of this embodiment, we will first explain the case where the camera Ca is set to the normal body shape state of (I31) in FIG. is in the on state, so the stopper 70 in Fig. 2 is in the solid line position in the figure and is designed not to stop the rotation of the rotating ring 16. In this state, press the release button (not shown) all the way down and press the switch. When 102e is turned on, the light emitting element 105 starts emitting light.At this time, if the subject is located between the lights and c,
1 reflection source is incident on the light receiving elements 108b and 108c, so the outputs D2.
When D3 becomes no level, the output A3 of the AND gate 124 becomes level 7, and the AND gate 127
Output A. holds the low level, and U32 7 fImK 133 t f(L
IVE-OT Pizu's single-handed power is at the level of Worou. Therefore, at this time, the output of the OR gate becomes high level, so after this, when you press the release button all the way down and turn on switch 103i, A, N
The D gate 135 outputs a release signal B, causing the rotating ring 16 in FIG. 2 to fully start rotating and moving the main lens 1. At this time, the lens (not shown) tlf! I j
The wholesale circuit is connected to the second circuit based on the output A3 of the AND gate 124.
Since the power supply to the magnet 64 shown in the figure is controlled, the main lens 1
is point 1], the movement stops at the point where the focus is in the middle of C, and after this / the camera is released and the picture is taken n7
).

On the other hand, if the subject is at the super close point d in this state,
Since the reflected light is incident only on the light receiving element 108d, the output of the compantor 114 becomes at a high level. Therefore 1. At this time, A N I) is the output A of the gate I27. becomes high level and IUXCLUS
Since the two outputs of the IVE-OR gate 132 are both at the 7-level level, their outputs are at the low level. For this reason, 2. Even if the switch 103 is turned on by pressing down the release button, the output of AND 35 becomes an e-level, and the release 1 word B is not output. Also,
In this case, the output of the OR gate 134 repeats a low level and a high level in response to the occurrence of the clock pulse C, so the light emitting diode 137 blinks to notify the photographer of this state.

Next, we will explain the case where the setting field is changed to the close-up view of camera Ca (Fig. 1) (q).
32 and each of the AND gates 121 to 126 - When the human power goes to low level, the VC and the strike sensor shown in the second figure are activated.
70 moves to the dashed-dotted line position to stop the rotating ring 16 at a predetermined position.

In this case, when the light emitting element 105 is turned on by turning on the switch 102, the light reflected from the object enters the light receiving element 108d, so the comparator -11.1 output ■) Only 4 becomes high level, and output A of AND gate 127.

becomes high level. Therefore, at this time, jjiXCLUS
Since each input of the IVj-OR gate 132 becomes a low level and a high level, its output becomes a high level, and when the switch 103 is turned on by pressing the release button thereafter, the release signal B is output from the AND gate 135.
is output. Furthermore, the rotation of the rotating ring at this time is regulated by the stopper 70, so that the main lens 1 always stops moving at a predetermined position. On the other hand, when the subject is at a position other than point d, (is the output A of AND gate 127.9, EXCL'USIVE-OR gate 1
32 are both at low level, AND gate 135 does not output release signal B even if switch 103 is turned on. Also, at this time, the light emitting diode 137 blinks to notify this state as in the case described above.

Next, FIG. 4 is a circuit diagram showing another embodiment of the present invention, and the differences between this embodiment and the embodiment of FIG.
US IVE-OR getter 132 DKOR gate 150 is distributed and output A. , A1 to O
R Geter 151. The point is that the output A'1 is output through 'i' and inputted to a circuit (not shown) on the 1/lens control side. According to this embodiment, the camera Ca is the first
Figure F#, (switch 104 set to BJ state)
is on, regardless of the position of the subject, the switch 103 is turned on and the release signal B is output from the AND gate 135, so if the subject is at point d, the output A of the AND gate 127 is . becomes high level, output A'rfr: high level, AN
The main lens 1 is stopped at the position where the movement of the lens 1 is stopped when the output A1 of the D gate 126 is at a high level, thereby preventing the main lens 1 from becoming significantly out of focus.

Note that the other operations are exactly the same as the previous example, so
For explanation here, +#! 9 I don't answer.

As described above, according to the present invention, in an autofocus camera that has a close-up function and that stops the I/I photographing lens at a predetermined position when the camera is set in a close-up spherical state, it is possible to This completely eliminates the fear of taking pictures that are not accurate.

Note that in this embodiment, the release is electrically prohibited, but instead of this, pressing down of the second stroke of the release button may be mechanically locked and prohibited. Furthermore, the present invention can be applied to any autofocus camera that measures the distance with the first stroke of the release button and moves the photographic lens completely with the second stroke. For example, JP-A-55-1
It is also applicable to the camera disclosed in Japanese Patent No. 15023.

[Brief explanation of the drawing]

Figure 1 (5), (E, tcJ) are cross-sectional views showing an embodiment of a camera to which the present invention can be applied, Figure 2 is a plan view showing an embodiment of a lens moving mechanism, and Figure 3 is a cross-sectional view of an embodiment of a camera to which the present invention can be applied. FIG. 4 is a circuit diagram showing an embodiment of the autofocus camera of the invention, and FIG. 4 is a circuit diagram showing another embodiment of the invention. 1...Main lens, 2...Sub-lens, 104... Switch, 105... Light emitting element, 108a-d... Light receiving element, 132... EXCLIJSIVE-OR
Kate, 135...AND gate patent applicant Canon Corporation

Claims (2)

[Claims] (1) It has a close-up function and an automatic focus adjustment function that performs the distance measurement operation of the distance measurement device before moving the photographing lens to the focusing position, and when taking close-up shots, the distance measurement output of the distance measurement device In an autofocus camera that stops the photographing lens at a predetermined position regardless of the situation, 1. During close-up photography, if the distance measuring device cannot detect that the subject is in a position where it can be photographed by the lens,
An autofocus camera characterized in that the release operation of the above camera is prohibited. (2) The autofocus camera as set forth in claim (1), further comprising a display means for displaying the above-mentioned re-focus prohibition state.