JPS62134634A - Display device for power focus of camera - Google Patents

Abstract

PURPOSE:To resolve the anxiety of a user by flickering a display device in accordance with the lens moving speed to inform the user that a focus lens is moved at the time of power focusing. CONSTITUTION:An operator controls the force applied to an operation ring 43 and its direction to perform the operation of power focus in the same operation sense as manual operation. When a mode changeover switch is switched to the power focus mode, the program operation of power focus is executed. If an SP flag is set, a display counter is set for high speed display, and the duty ratio of turn-on to turn-off of a pulse current which drives a lens driving motor 31 is set to a high value, and the lens is fed out or in quickly and flickering display is performed quickly. When a PFSPEED switch 13 is turned off, the SP flag is cleared, and the display counter is set for low speed display, and the lens is moved slowly and flickering display is performed slowly.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a power focus display device for a camera. The present invention relates to a focus display device.

[Prior art] An autofocus lens barrel using so-called power focusing, in which the focus lens of a lens barrel is moved by a motor, is known (Japanese Patent Laid-Open No. 59-64).
However, the only display in this case is a limit warning when the focus lens is at the infinity position or the closest position during power focusing.

[Problems to be Solved by the Invention] By the way, when the power focus U: ; is configured to change the moving speed of the focus lens into two stages, low J (fine movement) and high speed (coarse movement), low speed drive In this case, it is very difficult to check the focus state on the finder screen 1-, which makes the user feel uneasy about whether or not the focus lens is actually being driven.

The present invention was made in response to these problems, and is a power focus of a camera that allows users to know before use that the focus lens is being driven during power focus. The purpose is to provide a display device.

[Means and effects for solving the problem] As shown in FIG. 1, the power focus display device of the present invention transmits the operation signal output by the power focus operation member 1 to the power focus drive control lower stage 2! -j- Eh, the photographing lens 4 is driven by the motor 3 by the drive control stage 2.
In addition to performing the power focus operation of
During this power focus operation, the drive speed of the photographing lens 4 is adjusted! -'5+ is displayed by the power focus display means 5.

[Example] Is there any problem in applying power focus to cameras that do not have an autofocus function?
Since the present invention is installed in a camera such as the above, and is used for manual operation as an auxiliary means for focusing when the autofocus is not activated, an example in which the present invention is applied to an autofocus camera with an interchangeable lens will be described below. Therefore, first, the outline of the autofocus device will be briefly explained in 11j.

FIG. 2 is a schematic block diagram of an electric circuit of a camera straight focus device to which the power focus display device of the present invention is applied. Data is exchanged between the AF CPU 22, which is a central processing unit for automatic focusing, and the LIAIN CPU 14, which is a main processing unit for exposure adjustment, etc., via a serial communication line.

The communication direction is controlled by a serial control line. The contents of this communication include lens data on fixed lenses for interchangeable lenses, absolute distance information, and the like. In addition, from MAINCPU14 to AFCPU2
2, information on each mode of the camera (autofocus/single mode/autofocus/sequence mode/power focus mode/other modes) is decoded through the model line. Furthermore, MAINCPU
The AFENA (autofocus enable) signal from 14 to the AFCPU 22 is a signal that controls the start and stop of each mote of autofocus and power focus.
The EOFAF (ent of autofocus) signal to U14 is issued at the end of autofocus or power focus mode, and is used to initiate the transition to the exposure sequence.
;'1 is a signal that allows.

Further, the bipolar IC circuit 15 decodes the autofocus morph control line signal from the AFCPU 22 and drives the motor drive circuit 26. When the lens drive motor 31 is rotated by the output of the motor drive circuit 26, the slits 32 provided at intervals around the rotating part of the lens barrel open the light emitting part 33a and the light receiving part 33b across the passage of the rotating waist slit 32. Count the photo ink printers 33 or slits 32 which are arranged oppositely.

That is, the slit 32 and the photo ink printer 33 form the address generator 34 +, l, and S, and the address signal (callan l-(, i) of the slit 32) generated from the address generator 34 is The waveform is formatted and taken into the AFCPU 22.

The sub-lamp (hereinafter abbreviated as S-lamp) signal sent from the AFCPU 22 to the bipolar IC circuit 15 is a signal that controls the autofocus hli auxiliary light circuit 27. Turn on the lamp 27a.

The AF display circuit 24 connected to the AFCPU 22 is an LED (light emitting diode) that lights up when the focus is OK to indicate that the focus is OK.
24a and an LED to indicate failure to focus when it is impossible to focus.
241). Note that a clock oscillator 35 and a reset capacitor 36 are connected to the AFCPU 22.

Further, the AFCPU 22 and the A/D converter 21 exchange data via a pass line, and the direction of the data transmission is controlled by a pass line control signal. A sensor switching signal and a system clock signal are sent from the AFCPU 22 to the A/D converter 21. The A/D converter 21 is, for example, a CCD
A CCD control signal is sent to the CCD drive Cronk f8 for the focus sensor 20 consisting of
The output is read out, and the CCD output of the read analog value is digitally converted and sent to the AFCPU 22.

Terminals A, , A2 . of MAINCPU14. A3゜A4 has a power focus switch (hereinafter referred to as PFUP switch) 11 for extending the lens, and a power focus switch (hereinafter referred to as PFUP switch) for lens retraction.
A power focus/speed switch (hereinafter referred to as a PFSPEED switch) 13 for driving the lens at high speed is connected to the FDN switch (hereinafter referred to as the PFSPEED switch) 12, and the information is transmitted to the MAINCP via the model line.
The signal is sent from U14 to AFCPU 22 and decoded. This AFCPU 22 also controls the switches 11, 12 .
13, a control signal for performing each power focus operation is output. The relationship between each of these switches 11, 12, 13 and the power focus is shown in Table 1 below.

Table 1 (*Can be either on or off) /''- As is clear from Table 1 above, PFUP switch 1
1. When both the PFDN switches 12 are off or on, the lens drive motor 31 is in a stopped state, and the P
When the switch 11 for FUP is on and the swivel inch 12 for PFDN is turned on, the motor 31 rotates the distance ring toward the short distance side and extends the lens.
When the PFDN switch 11 is off and the PFDN switch 12 is on, the motor 31 is in a reverse mode that rotates the distance ring toward the long distance side and retracts the lens. When the PFSPEED switch 13 is on, the motor 31 is driven at high speed to perform coarse movement of the distance ring, and when it is off, the motor 31 is driven at low speed to perform fine movement of the distance ring.

Next, FIGS. 3(A), (B) and 4(A),
An embodiment of the operation section of the power focus display device of the present invention will be described with reference to (B) and (C). At the same time as the conventional manual distance ring, the operating ring 43 is arranged in an annular manner on the interchangeable lens mounting portion 45 of the camera body 41 (see Fig. 3(A)) and the interchangeable lens barrel. 4
There is also one arranged in a ring shape on the second side (see FIG. 3(B)). This operation ring 43 is operated as shown in FIG. 9(A) to
It is formed so that it can rotate together with the switch ring 44 shown in (C). This switch ring 44 is
i'iii End of MAINcPU14-f A 1. A
2.

A3. Movable contact piece 11 yen of switch 49 connected to A4
49al, 49a2. 49a3 and 49b1.
A switch opening/closing protrusion 44a for connecting and separating 49b2 and 49b3, and a reciprocating protrusion 44b that engages with the spring member 46 in a direction forming 90'' with the protrusion 44a are provided on its circumference 1-, Further, on the periphery on the opposite side from the L letter starting portion 44a, a two-stage clink 47 for position regulation is formed, and is formed of an annular member with an opening for the photographing optical path in the center. ing.

The switch 49 is attached to a pair of mounting portions 49a and 49b in a symmetrical arrangement. T49a1-49a3. 49bl to 49b3, the inner contact pieces 49al and 49bl that engage with the protrusion 44a of the switch ring 44 are elastic conductive contact pieces that extend straight, and the inner contact pieces 49a2. 49))2
and outer contact piece 49a3. 49b3 has the elasticity to make the abutting part curved at the tip, which is one length longer than the other.
It is formed from 9 electrical connections J'+'I:'T. From the pair of mounting parts 49a and 49b, 2MAlNCP
U 140ffi#J'-A,, A2. A3. A4+:
Each connection line is wired. Contact pieces 49al and 49
a2 is the PFUP switch I in the direction of feeding out the lens.
The pieces 49a2 and 49a3 similarly form the PFSPEED switch 13 in the extending direction of the lens h.Also, the contact piece 49bl on the mounting portion 49b side.

491)2. 49 b3 also has lens renormalization J
j-direction PFDN switch 12 and PFSPEEDJ
11 switches 13 are formed.

The spring portion 446 that engages with the first movable protrusion 44b of the switch ring 44 is formed by winding the central portion into a coil shape, and this portion is attached to a stationary member (not shown). , 46b sandwich the protrusion 44b. And the f students are
By abutting an immovable stopper member 46c, which is slightly wider than the protrusion 44b at the intermediate portion, the force of the spring member 6 is prevented from acting on the protrusion 44b. Furthermore, the click groove 47 has the same click li? The click spring 48 having a bent portion matching the shape of r47 is fixedly fixed γ1 to a fixed member (not shown) of the interchangeable lens tnLηi42 or the interchangeable lens mounting portion 45 so as to be engaged therewith.

Next, the operation of this switch ring 44 and switch 49 will be explained. First, when the operating ring 43 is not operated, the switch ring 44 is in the state shown in FIG. 4(A). That is, the switch ring 44 is in a state where the click spring 48 falls into the click groove 47 and is engaged. Therefore, at this time, since both ends 46a and 46b of the spring member 46 are in contact with the tension bar member 46c, no force is applied to the protrusion 44b of the switch ring 44.

In addition, in this state, the contact piece 49al of the switch 49,
49a2. 49a3 and 49bl, 49b2 and 49b3 are not in contact with each other, and the PFUP switch 11. The PFDN switch 12 and the PFSPEED switch 13 are each in an off state. If the operator manually rotates the operating ring 43 in the direction of the arrows in FIGS. 3(A) and 3(B), the state shown in FIG. is finely adjusted in the feeding direction.

That is, the switch ring 44 also rotates in the direction of the arrow j, and the click spring 48 engages the first notch step 47a of the click groove 47.
11 in a state where it crosses over and abuts the second notch step portion 47b.
- At this time, the protrusion 44b of the switch ring 44
In order to push up one end 46a of the spring part 46, the spring part 10 is charged, and the protruding part 44a of the switch ring 44 pushes the contact piece 49al and brings it into contact with the contact piece 49a2. The switch 11 is turned on.Therefore, the lens is moved slightly.When the force applied to the 20-shaped deaf operation link 43 is removed, the switch ring 44 is moved by the tU dynamic force of the spring part I/146. The force action causes the state to return to the state shown in FIG. 4(A).

Next, when the operating ring 43 is rotated in the direction of the arrow j by applying further force from the state shown in FIG. 4(B), the click spring 48 clicks 7i? The second [;7J of r47 goes over the step part 47b. Then, the protrusion 44b of the switch ring 44 comes into contact with the stopper member 50a, and its rotation is restricted. At this time, the contact piece 49al of the switch 49,
49a2. All of 49a3 are in contact. Therefore, the PFUP switch 11 is turned on, and the PFSPE
The ED switch 13 is also turned on, the autofocus morph 31 rotates forward at high speed, and the lens is coarsely adjusted in the extending direction. When the force applied to the operating ring 43 is removed from this state, the reciprocating elasticity of the spring member 46 applied to the protrusion 44b of the switch ring 44 causes
), the operation ring 43 and switch ring 44
11: Returns to the state shown in FIG. 4(A).

When the operating ring 43 is rotated in the clockwise direction Ji direction opposite to the arrow, the operation is exactly the same or the contact piece 4 on the opposite side
9bl, 49b2. 49b3. Click groove 4
7 and the other end 46b side of the spring member 46, and the PFDN
switch 12 and P F S P E DJ II
The switch 13 is turned on and the lens is operated in the retraction direction.

In this way, by controlling the force and direction applied by the operator to the operation ring 43, the first stage of low-speed fine adjustment, the second stage of high-speed t11 movement, M node, etc., and the spring member 4 can be adjusted.
Since the force of 6 is applied to the switch ring 44 differently,
You can operate the power focus with almost the same feeling as conventional manual operation.

In the present invention, when the operating ring 43 switches between a moving state in which the lens moves at high speed and a fine moving state in which it moves at a low speed, the coarse moving state and the fine moving state are displayed as described below. It can be confirmed by.

Next, the operation of the power focus display device of the present invention will be explained based on the flowcharts shown in FIGS. 5 to 9. When the mode selector switch (not shown) is selected to power focus mode, the power focus (
Program operation A'1 in the flowchart of PF) is now executed.

The program operation of this <PF> is MAINCP
A determination is made as to whether the AFENA signal from U14 is at "H" level (active). AFEN
If the A signal is not active, it returns; if it is active, that is, if the first step of the release button is on, the EOFAF signal is activated and the second step of the release button is received. can be attached. In other words, it is possible to shift to the exposure sequence even during power focus. After this, the <lens read> subroutine is called and ROM1 in the interchangeable lens barrel is read.
1; After reading the lens data such as the duty ratio of the power focus driving pulse current, the state change flag is cleared. The state change flags include a speed change (DI FSP) flag, which is activated when the speed changes, and a mote change (DI FMOD) flag, which is activated when the mote changes. After this, the count value of the display counter is cleared. This display counter is an 8-bit counter for setting the lens drive speed display time. After this display counter is cleared, the subroutine ``Mode Read'' is called, and here the instructions for the rotation direction of the lens distance ring and the speed of lens drive are read, and the rotation direction of the lens distance ring is increased (UP). ) is set or cleared, and the speed (SP) flag is set or cleared. That is, the PFUP switch 11 regarding the operation mode of the lens drive motor 31 shown in the first section. The on/off states of the PFDN switch 12 and the PFSPEED switch 13 are read. When the swivel inch 11 for PFUP is set, the direction of rotation of the distance ring is in the UP (lens extension) direction, and when the PFDN switch 12 is turned on, the direction of rotation of the distance ring is in the DN (lens extension) direction. Become. Then, the SP flag is determined, but the P
When the FSPEED switch 13 is turned on, this S
The P flag will be set. When the SP flag is set, the display counter is set to the count setting value (HI) for 1: The off duty ratio is set to 11, and the lens is extended or retracted and the blinking display at that time is set to occur at high speed.

Also, when the PFSPEED switch 13 is off, the SP
The flag is cleared and the display counter is set to the count setting value (LO) for low speed display, so in this case, the duty ratio of the motor drive pulse current is set to a lower value.
It is set so that the movement of the lens and the flashing display at that time are performed at a low speed. After this, call the Power Drive subroutine. In this power drive, the motor 31 is turned on according to the duty ratio set above.

The off state is controlled and lens driving for one pulse is performed.

Next, after a judgment is made as to whether the lens has stopped by hitting the 5 (1) (extreme (■)) or close limit position and has stopped, if the lens has hit the limit position and stopped, the motor is stopped. Apply the brake for about 100ms, call the absolute distance counter subroutine, and set the absolute distance counter to 0 or the maximum value.Then, while in this state, press Mode Change to see if you want to change to the mode signal. It waits while going around the loop of Limit Warning. In Damn Change, PFUP
Switch for 11. Change in state of PFDN switch 12 (
The mode change) and the state change (speed change) of the PFSPEED switch 13 are checked, and if there is a mode change, the DI FMOD flag is set,
If there is a speed change, the DIFSP flag is set. If the DIFMOD flag is set, this is determined and the process returns to the position (■).

As shown in Figure 6, the subroutine ``Limit Warning'' is executed by turning on the LED 24b (see Figure 2) for displaying the inability to focus.
While turning on and off for a certain period of time, the out-of-focus display is written on the LED 24b.4. ';, this is done by blank display.

On the other hand, the lens does not reach the end position +l'-'::
In the case of 'r' power focus operation, in the speed adjustment routine, the lens drive speed is adjusted so that the drive and fine movement speed is determined by the duty ratio of the motor drive pulse current determined by the user. Turning on the motor in i.
Fine-tune the off duty ratio. That is, the subroutines are performed by adjusting the speed by turning on and off the lens drive motor, power drive>, speed, and IF, I adjustment. After this, check the AFENA signal, and if the same signal is active, that is,
When the operation of the first stage of the release button "1" is on, call up "Moto Change", and at this time, if a speed change is made and the DIFSP flag is set, leave it at the ■ position. Return, if there is no speed change and the DI FMOD flag is set and a motor change is made, the brake is called to stop the motor, and the absolute distance counter subroutine is set to the count value of the absolute distance counter. Set +1 or -1
- and return to position ■. If there is no speed 1 change or mote change, the process returns to the position (2) through the subroutine of <PF left display.

Therefore, as long as the operation of the first stage 1-1 of the release button is kept on, j! ! (If there is no mode change or speed change from the farthest or closest limit end to the other limit end, this loop Ω of <PFi display> → power drive> - <speed adjustment> - <pp display> is passed. , the lens drive and display during power focusing continues to be <-i.

As shown in Fig. 7, the operation of the above <PF left display subroutine is such that 1 is added to the count value of the display counter each time the loop Ω is passed once, and the count value of this display counter is Keep the display flag constant at 1'11 until the count setting value is overflowed? If the doujinshi flag is set to "1", the focus is OK.
Turn on ED24a, and if the display flag is cleared -1: Turn off LED24a. Then, when the count value of the display counter or the count setting value in 1- is overflowed, the display counter shows +1G degrees.
After the high-speed display count setting value (Hl) or the low-speed display count setting value (LO) is set, the display flag is inverted by adding a complement. When the display flag is highlighted,
If the focus OK indicating LED 24a is on before the inversion, it is turned off, and if it is off, it is turned on and the process returns.

In other words, the time to execute the above loop Ω is set to a constant value, and the loop ΩX (25[1-n) times (n is the high-speed display count setting value preset in the 8-bit display counter). (Hl) or low-speed display count setting value (LO)), the display flag is inverted every time. For example, in the case of low-speed display, LO = 50, and the focus OK display LED 24a blinks after passing through loop Ω 256-50 = 206 times, and in the case of high-speed display, LO = 206, and the loop Ω256-206
-The first LED 24a blinks after passing 50 times.

In this way, by repeating the loop Ω described in 1), if the lens is being driven at high speed, the LED 24a for indicating focus OK will flash at a high speed, and if the lens is being driven at low speed, If you are tired, this LE
A slow blinking display is performed by D24a.

The <PF display> subroutine shown in FIG. 6 may be used instead of the <PF display> subroutine shown in FIG. 5 above. In this case, use the address count interrupt routine shown in Figure 7 to check whether there is a change in the address signal, and add 1 to the count value of the display counter every time the address signal changes. I'll do what I want. If the count value of the display counter that counts in this interrupt routine overflows the set value by counting 50 pulses or 256-50-206 pulses of the address signal as shown in FIG. Similar to the <PF display> flowchart shown in FIG. 5 above, after resetting LO or Hl in the display counter, the complement is set in the display flag, and then the display flag is determined and the focus is determined by t. OK display LED2
Turn on or off 4a and return.

For example, as shown in FIG. 10, the focus OK indication LED 24a, focus f (and focus failure indication LED 24b) are displayed below the two image frames 51 in the viewfinder, respectively, in green and red colors. Alternatively, as shown in FIG. 11, the LED 24a may be displayed in close proximity to the display section 52 of the exposure value of "L" and "9" of the camera body 41.

24b may be provided.

Regarding the focus OK front LED 24a, as explained in the flowchart above, the PFSPEE
When the D switch 13 is turned on, the count setting value of the display counter is set to HI, and - [2 LEDs
24a performs a flashing display at a fast cycle t1 as shown in FIG. 12(A).

Moreover, when the PFSPEED switch 13 is turned off, the count setting value of the display counter is set to LO, so the LED 24 is turned off as shown in FIG. 12(B).
A flashes at a slow period t2. As for the out-of-focus display LED 24b, as mentioned above,
Operations such as limit warning (see Figure 6) are shown in Figure 12 (C
), this is performed by blinking the out-of-focus display LED 24b at a constant period t3.

In the above embodiment, when the lens is moved, the focus OK display ED 24a, which is also used during autofocus, is made to blink, but the focus OK display LED 24a originally indicates that the focus state has been obtained. For example, as shown in FIG.
In the case where the front focus and rear focus display LEDs 53 and 54 are arranged on the left and right sides of the front focus and rear focus display, which blink when the camera is out of focus during autofocus, as shown in FIG. Each of the above LEDs 24a, 53
．． 54 is the exposure display section 52 on the - side of the camera body 41.
If the lens is arranged close to the LED 53, 54, the following display can be performed during power focusing. That is, when the lens is being extended at a high speed, the LED 53 flashes at a fast cycle tl as shown in FIG. In this case, as shown in FIG. 15(B), the LED 53 indicates a slow cycle! '+1 t 2 causes blinking display. When the lens moves in the direction of retraction, the LED 54
Similarly, when the speed is high, a flashing display with a fast period t1 is performed as shown in FIG. 15(C), and when the speed is low, a flashing display with a slow period t2 is performed as shown in FIG. 15(D). or will be carried out. Furthermore, when the lens reaches the infinity position or the closest position, the two LEDs 53 and 54 blink at a constant period t3, as shown in Fig. 15(E), and the limit 'g<'I- will be carried out.

[Effects of the Invention] As described above, the Kikomei system allows the user to see whether the focus lens is moving during power focusing or by displaying a blinking display on the display means according to the state of lens movement.
Since the user is notified in terms of the lens movement status, the user can confirm the lens movement status in terms of 2;:ζ, thereby eliminating the user's anxiety.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the general structure of the power focus display device of the present invention, and FIG. 2 is a schematic block diagram of an electric circuit of an autofocus device of a camera to which the power focus display device of the present invention is applied. 3(A) and 3(B) are external perspective views of a camera showing an example of the arrangement of the operation part in the power focus display device of the present invention, and FIGS. 4(A) to 4(C) are L notation. Figure 3 (A). Figures 5 to 5 are top views showing the configuration and three operating states of the switch jT that moves f'I in conjunction with the operating member shown in (B).
FIG. 9 is a flowchart showing the operation of an embodiment of the power focus display device of the present invention, FIG. 10 is a front view of the finder section showing an example of the power focus display mode by the device of the present invention, and FIG. A perspective view of a camera showing a modification of the power focus display mode shown in FIG. 10 above,
12(A) to (C) are time charts for explaining the blinking display mode of the display LEDs 24a and 24b in FIG. 10.11, and FIG. 13 is a time chart of the power focus display device according to the present invention FIG. 14 is a perspective view of a camera showing a modification of the power focus display mode shown in FIG. 13 above,
FIGS. 15A to 15E are time charts 1 for explaining the blinking display and mode of the display LEDs 53 and 54 in FIGS. 13 and 14 above. 1... Power focus operation member 2... Power focus drive control means 3... Camera 4... Taking lens 5... Power focus display means 3rd eye (A) (B) 40th 6 Figure 1 of the same Figure 8 Figure 9 of the same Figure 10 Figure 11 Figure 12 Amendment to the Proceedings (Voluntary) 19861
Month 1711 1, Incident Display 1985 Patent Application No. 2764
09 No. 2, Title of the invention Camera power focus display device 3, Name of the person making the correction (037) Olympus Optical Industry Co., Ltd. “Detailed description of the invention in the specification” 6. Contents of the amendment Description Section 21 Delete "+1 or -1" written on the second line from the end of the first buy line.

Claims (1)

[Scope of Claims] A power focus operation member that outputs an operation signal for driving a photographing lens with a motor, a power focus drive control means that controls the drive of the motor in accordance with the operation signal, the power focus drive 1. A power focus display device for a camera, comprising power focus display means that performs a blinking display according to the moving speed of the photographing lens while the motor is being driven by the control means.