JPS5885407A - Auto-focusing device - Google Patents

Abstract

PURPOSE:To focus a camera on an object to be photographed or a moving material at the boundary point, by selecting a range including partially overlapping adjacent distance ranges of plural photographic distance ranges and providing a means which focuses the camera only in the selected distance range. CONSTITUTION:The length between the closest position and the infinity position from a camera is divided into four by positions P1-P5. Image reforming lenses 3 and 4 are arranged symmetrically with respect to an object lens 2 to lead the light to light receiving faces of photoelectric elements 5 and 6. Signals from arrays are inputted to a processing circuit 7 from terminals (a) and (b), and a motor 9 is driven through terminals (d) and (e) by a driving circuit 8. The lens 2 and a conductive member 11 are interlocked with each other and are brought into contact with contacts 13-17 to transmit the state of contacts from the input terminal (e) to the processing circuit 7. Four stages F, M, N, and FULL are selected by an operation member 19 of a selecting switch part. When the stage M is selected, the voltage of the contact 14 becomes Vcc, and the voltage of the contact 16 becomes the ground, and the lens 2 is moved between positions P2 and P4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for selecting any one of the ranges of hard number distances 1i1fff, which are included within the entire object distance range, respectively. The present invention relates to an automatic focusing device that drives a lens to focus only on objects within a certain range.

Speeding up the focusing band of an automatic focusing device, preventing unnecessary movement of the photographing lens due to objects other than the main focus, or shifting of the distance measurement area due to manual fL, etc. There are as many subjects as rice grains at a distance above, 9 of them.
In order to focus on a subject with constant ν, it is necessary to divide the total shadow distance range into several ranges, that is, the total shadow distance t+
It is already possible to divide the entire driving range of the photographic lens corresponding to lH+n into several ranges, and drive the photographic lens so that it will only hit objects within the selected distance range. I'm here.

However, if the entire driving range is divided into several zones, then 8+11 will result in the following Q1 to Q! , Qz～Qs
, Qs to Q4: ,Q2
- Q3 is the same, "medium", and between Q3 and Q4, "
In the configuration set to "Far", the subject is in the valley i1M':
4 Is it rather inconvenient that it is located near the boundary point of Mlll depletion, that is, Q2 or Q3, and it becomes a light focal point or an unnecessary rudder for a knitting that is more than enclosing the crotch? rice bowl

(3) Table 1 In order to solve the above-described non-t11X focus, the present invention is configured to focus only on a subject within a selected distance range, and to focus on one subject within a selected distance range. The purpose is to create an automatic goldfish device that is a duplicate of the 1191S.

Hereinafter, the invention will be explained with reference to the drawings. In Figure 1,
At the right end is the camera 1 with the autofocus fK: 1 added.
Let sωi~71-'' be Pa, and the nearest position Pl
From ■ position P5 to the sharp point ke 116 Yu P2, Pa
, P4, the focal range of the field of camera 1 is divided into four parts.

(4) FIG. 2 is a principle diagram of an embodiment of the present invention, in which a pair of re-imaging lenses 3 and 4 are symmetrically arranged with respect to the optical axis of an objective lens 2 for photographing.
are arranged, so that a part of the light beam transmitted through the objective lens 2 passes through the re-imaging lens 3.4 onto the light-receiving surfaces of the pair of photoelectric elements 5.6, respectively.

A pair of photoelectric elements 5, 6 act as a photoelectric exchanger for the detection of the bride 1 in an upright position, and specifically consist of a photoelectric element array. The processing circuit 1 includes one from a pair of photoelectric element arrays.
By manually inputting power signals from terminals a and b, and comparing the signals, the front bin, rear bin, and focus state can be determined. Based on the results, the motor drive 1 connected to terminals d and e
A motor 9 connected to this circuit 8 through a single circuit 8 and a single screw f1g is driven, and the objective lens 2 is moved to the focusing position by 100 rotations of the gear head.

Part of the specialized turtle member 11 is a member that moves in conjunction with the objective lens 2K, so that the objective lens 2
drive position (hereinafter referred to as p.

When the conductive member 11 is in the position corresponding to
is at the position of the electrical contact 13, when it is in the A At times, P5 is placed at the electrical contact 16 position.
When there is a position VC corresponding to , the conductive member 11 is located at the position of the electrical contact 11. This conductive member 11
When the contact point 12 contacts any one of the electrical contacts 13, 14, 15, 16, and 11, the contact point 12 becomes conductive and connects with the electrical contact through the member 11. become.

Electrical contact 13 is always in the Vcc state, and electrical contact 17
is always in the ground state. Other electrical contacts 14
．． 15 and 16 are set to n, Vcc, ground, or oven eaves, respectively, depending on the operating member 19 for selecting the shooting distance range. M (The status of the gas contacts 13 to 11 is transmitted to the electrical contact 12 via the specialized member 11, this information is sent to the monument 18) +il and then from the human power terminal C to the processing circuit? VC transmission is carried out. When the output signal of the 4-wire 18 is Vcc, the processing circuit 7 drives the motor 9 via the motor 1:drive circuit 8 so that the objective lens 2 moves from the close side toward the near side (towards the right in the figure). Rotate 1
When No. 6 is output and the output multiplication frequency of conductive 18 is ground,
Objective lens 2 is CX: 11iIll to close 11+lj
Outputs a signal to move toward (towards the left in the figure).

A detailed explanation of the processing circuit 7, motor, and drive circuit 8 will be given later with reference to FIGS. 3 and 4.

To explain the structure of the switch part for selecting one word from the 11 ranges in the photographing section, this selection switch part is connected to the operating member 19.
It is now possible to select all 15 of the four stages: F%M, N, and FULL. Conductive members 20 and 21 are connected to the insulating operating member 19 at regular intervals, and the selection switch section is connected to an electric contact 22 to which Vcc is applied; Electrical contacts 23, electrical contacts 24-31 (broken) Contacts 24, 25, 28, 31 shown as glands (7) may be omitted. ).

FIG. 2 shows a state in which the operating member 19 is set to M. In this state, the conductive members 20, 21 fixed at regular intervals to the operating member 19 follow the electrical fixing points 26, 30, so that the electrical contact 14 receives Vcc and the contact 16 receives ground. However, the voltage has been applied completely. Therefore, in this state, the electrically conductive member 11 is stuck between the contact lenses 14 and 16, and the objective lens 2 moves to a position corresponding to P2 and P4. Note that even if the initial position [rf of the objective lens 2 is not at 111 of the first path corresponding to P2 and p, I
! fP * or position corresponding to P4, overhang 7'L
Thereafter, l(!Iij+ (.This will be explained in detail later) only within the desired range.

In the same way, when setting the 19th F in operation 1i114, the first force points 13 and 15 become Vcc, the fixed point 11 becomes ground, exclusive +1r, I≦IS 11 becomes '1ti(
8) Air fixation point 15 and 17 1 field Y: jtυ, operating member 19
When NK is set, '1) ■ Air contact 13 becomes Vca, contact 15 becomes ground, and 'L! The member 11 will move through one of the electrical contacts 13 and 15.

Also, when the operation part 19 is set to FULL, the electrical contact 1
3 or Vcc, the contact 17 is always connected to the ground, and the contacts 14 to 16 are in the open state, so the conductive member 11 connects the electrical contacts 13 and 17 with mh.

Table these relationships? When expressed using the following table 2.

Table 2 As shown in Table 2, the operating member 19YF.

Since the shooting distance ranges when set to M, N, and FULL partially overlap, even if the subject is moving around, for example, near boundary point P3 of the distance range when set to F. , the photographer can safely set the operating member 19 to M without hesitation in selecting a distance of 1 or 4, and quickly take the 10th image by focusing the light amount tC on the desired object. I can do it. In this way, one force is j'17tl! Of course, when the boundary point of the distance range is not near the boundary point of il, of course, you can select the boundary point of the distance range r (even when there is, the entity will surely enter). You can take pictures conveniently.

In the above persimmon example, there is 1 recombination! Lens 3.4, optical element 5.6, processing circuit I and nt #+ (see Figure 4)
7L is provided on the camera body or the finder surrounding the body Vc iron layer. In Moku Bimei, the camera body is self-U'
Y, ;0) Or father (if the main finder camera body is used as a shield function, the camera body and the father finder are collectively called a camera. and '1 Ujimoto (see No. 41y1) and the camera, and
This shows an example in which all of the 1'λ2 elements other than 1'λ2 are installed in an interchangeable lens barrel that can be transported to and removed from the camera, and the contact points c, d, and e are the 5' This is what makes the connection.

FIG. 3 shows an example of the circuit 7 shown in FIG. 2, and the input/output terminals a, b, c, d, and e in the figure are the same as those in FIG.

Outputs from the optical oxygen elements 5 and 6 are input to input terminals a and b, respectively.

In some cases, the first shift of these is input to comparators 101 and 102 through the Mrm amplifier 100, and the threshold 11
01 pressure is comparatively softened as ■, +, and ■-.

On the other hand, the comparators 111 and 112 are manually operated, and the output is compared with the threshold 11u' tonne pressure vr+.
Input to R gate 113. Then, the outputs of Kamikochi's comparators 101 and 102 and gate 113 are N A
N I) Since 7L of human power is required for gate 114, gate 1
14 outputs L when focusing, and outputs H when 1 flood occurs. Therefore, when the output of the gate 114 is L, the gates 115 and 116 both output L regardless of the output of the flip-flop 110, and when the output of the gate 114 is H, the output of the flip-flop 110 is Print the output. In the case, the outputs of gates 101 and 102 are gates 108 and 109.
The rotation direction of the motor 9 is output via the flip Φ-flop 110 as a signal indicating the direction of rotation of the motor 9.

In addition, when the input terminal C is set to ↑Mf at the position of the pair of noses 2, the state of Vcc1 oven and ground chair L is applied, and the gates 103 and 104 are connected to the The output of the flip-flop 110 is inverted by receiving the outputs of the transistor group, which vary depending on the Q, 110, and C of the flip-flop 110. When terminal C is open, the gates 103 and 104 are connected to the harmful wire 105.
．． 106 11. ll and Vcc is 7t, but when the terminal cVcVac is applied, the gate 104 outputs )N, AM106] and the ground is input! Therefore, only when the output of the flip flop 110 is L, that is, only when the motor 9 is driving the object 1 and the nons 2 from infinity to the nearest direction, the output of the gate 104 is sent to the flip flop via the gate 109. The output of flop 110 is rejected. Note that even if the terminal C is applied to Vcc, the flip-flop 110 will not be reversed if the rotation direction of the motor 9 is reversed. When the ground is applied to the terminal C in the same G*K I, the ground is input to the gate 103 through the conductor 105, so the motor 9 drives the objective lens 2 from the close range to the infinity direction. The output of gate 103 inverts the output of flip-flop 110 only when Thus, A N 1) Gate 115
．． 116 includes a flip-flop 110 and a gate 11
The output of 4 is transmitted manually to terminals d and e.
Sign. In the focus matching state, the terminals d and e output signals that vary from H to L depending on the direction in which the objective lens 2 is driven. In the focused state, both terminals d and e become L.

FIG. 4 shows an example of the motor drive circuit 8 shown in FIG.
The input terminal d1e in the figure is the same as in FIGS. 2 and 3, and the output terminal d1e is the same as that in FIGS.

g is J... as in Fig. 2.

When terminals d and e are both at L, transistors 120 and 122 are turned off and transistors 121 and 123 are turned on, so that terminals f1 and g are short-circuited and the motor 9 connected therebetween is stopped. Terminal d is H, terminal e
When outputting L'Y, transistors 121 and 122
is on, transistors 120 and 123 are off, and current flows from terminal g to terminal f via motor 9.
The motor 9 moves the lens 2 to the left in FIG. Roll 11. When the terminal d is L and the terminal e outputs ■, the opposite is true.

The operation will now be explained based on section 89 of FIGS. 2 to 4.

As an example, the position where the objective lens 2 corresponds to PIVC and P,
The subject is located between the positions corresponding to P2 and P4, and the selection distance range is as shown in FIG.
Let's start with the initial 1υ1 state 1μ where K is set.

The rotation of motor 9 is determined by the initial state of flip-flop 110. For example, in the output Q7111''-L of the flip-flop 110, if the output Q is H and is in an out-of-focus state, the terminal d is connected.

Terminal e outputs )I. Therefore, the motor 9 rotates [I-+1] so as to move the lens 2 to the right in FIG. Then, lens 2 exceeds the position corresponding to P2, that is, 4
When the main member 11 crosses the electrical contact point 14, the outputs of terminals a and b become equal, and if both terminals a and b have a certain level of output, the object is in focus.

Therefore, the outputs of the output terminals d and a of the processing circuit 1 are both L.
As a result, the motor 9 stops.

In addition, in the above initial state dust, the flip-flop 110
If the initial state of is such that the output QfJ)H and the output d output L, the terminal d outputs H1 and the terminal e outputs L. Therefore, the motor 9 reverses so as to move the lens 2 to the left in the ε02 diagram. When the lens 2 reaches the position corresponding to pl, that is, when the conductive member 11 reaches the electrical contact 13, the terminal d is turned and the terminal e is reversed to H, so that the lens 2 moves to the right in Figure 2. It starts. In this way, the lens 2 crosses the position corresponding to the P part and becomes in focus as described above, and the output terminals d and e of the processing circuit 7 both output L, and the remoter 9 stops.

In this way, no matter what initial position 1t11 or 1q the lens 2 is at, the lens 2 enters the drive range corresponding to the selected distance range and comes into focus within this range.

Next, FIG. 5 shows an embodiment of the principle shown in FIG. This is an example where all of the above are incorporated into Gerens'd'l1v5. Second
Components having the same features as those in the principle diagram shown in the figure are indicated using the same numbers or symbols as in FIG. 2. Since the principle of the present invention has already been explained using FIG. 2, the explanation will be kept brief here. In the figure, numerals 40 to 49 are objective lenses for a truncated shape. 8 is a motor drive circuit, 9 is a motor, 10
is the gear head, and the final gear 5 rotates around the optical axis.
The lens support portion 51 is moved through the lens 0. Note that among the objective lenses, lenses 43 to 45 are moved by a support member 51 to adjust the focus. The 4-electro member 11 is a member that moves in conjunction with the objective lenses 43 to 45.
By contacting electrical contacts (not shown), positions 43 to 450 of the objective lenses 450 and 450 contribute to outputting a signal representing the signal.

The operating ring 52 is an operating ring for selecting a shadow distance range.
By rotating this to a predetermined position, the 61S material 53 (corresponding to 19 in Fig. 2), which is directly connected to the rod, rotates, and 14 sleds appear at its tip! 1- conductive member 54
(corresponding to 20 in FIG. 2) and another specialized member (not shown) (corresponding to 21 in FIG. 2) move to predetermined positions to connect the electrical contact group 55 (corresponding to 22 in FIG. 2). ~Equivalent to 31)K
act to output the desired signal.

The principle of the entire switch section for selecting the photographing range is as shown in FIG. 2.

Figure 6 is a specific example of using a flexible printed board for the electric transmission part inside the lens camphor cylinder shown in Figure 5, and is intended to be incorporated into the concrete board 1 shown in Figure 5. It is. In the figure, 63 is a portion of a motor drive circuit, which corresponds to the circuit 8 in FIGS. 2 and 5. Reference numeral 64 denotes a portion that outputs a signal representing the position of the objective lens, which is located on the surface 10 and corresponds to the electric contacts 12 to 17 in FIG. 65 is shooting distance l
1iIl range This is the electrical contact portion of the switch section for selection, and corresponds to the electrical contacts 22 to 31 in FIG. 2 and the electrical contact group 55 in FIG. 5.

FIG. 7 is an external view of the lens≦signature cylinder 56 shown in FIG.

In addition, in this Example VC, an example is described in which the shooting distance range of the subject is divided into 4 areas, but regarding the number of divisions, it may be more than 4 areas or less. By providing a corresponding photographing range selection switch, it is no secret that it is a practical feature.

In the actual sister example, the distance range (Pl-Ps) and the distance range (Pa~
P4 ) is the sweet distance range (pi~P4) and last name! The distance ranges (Pg to Ps) are set so that they are aligned with each other. However, as shown in Table 3, instead of distance #: range (Pt~ps), distance range (P1~Pa)
may be established. That is, in the present invention, it is sufficient that the adjacent distance ranges are at least l- from each other.

Regarding No. 48 indicating the cut-off limit, in this example, Vcc,
If it is possible to identify the signal using Guérande, the signal will not be ignored.

As for the distance measurement method, although the TTL method was used in this embodiment, it can also be implemented in an automatic focusing device a using other distance measurement methods such as an external light method or an active method.
).

As described above, by partially duplicating the distance range to be detected by the N Vfs i1M according to the present invention, there are disadvantages when the subject moves around near the boundary of the distance range to be selected by conventional hitting [4] can.

A focus detecting means consisting of deflection elements 3 to 6, etc., and an ili! consisting of element 7, etc. I control means is provided in the camera, and driving means consisting of elements 8 to 10, etc., and selection means consisting of elements 11 to 17, 19 to 31, etc. are provided in the interchangeable lens f/f tube. Even if an interchangeable lens for adjustment is attached, automatic focus adjustment can be performed by the focus detection means and control means of the camera, and an appropriate distance range can be adjusted for each interchangeable lens with different focus apertures and lens image output. Can be set.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the spatial position of the object field, FIG.
FIG. 4 is a circuit diagram showing an example of a processing circuit, FIG. 4 is a circuit diagram showing an example of a motor drive circuit, and FIG. 5 is a circuit diagram showing an example of a motor drive circuit, and FIG. FIG. 6 is an external view of an example of a flexible printed board of the electric transmission part when the device according to the present invention is incorporated into the lens barrel except for a part,
Figure 7 shows the device according to the present invention, excluding a part of it.

[Nons 9.
1. It is an external view of an example of a lens barrel when it is assembled into a cylinder. [Explanation of symbols of main parts] Focus detection means...3 to 6 Driving means...8 to 10] 8 selection means...11 to 11. 19 to 31 10 stages of control...
・1

Claims (1)

[Claims] 1. A focus detection means, a driving means for driving a photographing lens by 4ft+, and a total distance of 1.
1 fl'i ＋
41 range, and there is a part of it within the adjacent distance that is only about 1 chair out of the 11th grade. , 'IF range is selected by the selection means and the careful selection means (9/!r'
Then, the selected distance #1 is set to focus only on the subject.
Take advantage of it! 2. A focus detection means, and the detection means receives No. 'flilJflll
Control means for outputting ll signal +j? Place the removable lens barrel 1c on the camera you have, and move it from the camera to the lens barrel 1]11
III. A driving means for driving the shadow reflection, selecting a specific distance range included in the total shooting distance if and a selection means for transmitting a restriction signal to the control means so that the photographing lens focuses only on the lens specification m03. How close is the shooting distance range?
; option 4) <at least two of the distance ranges to be 1111-re+t I[S, the ranges are set to be partially separated from each other;
The lens mentioned in the section.