JP2004309867A - Automatic focusing device for camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic focusing device where a focus detecting system is switched in accordance with photographing circumstances. <P>SOLUTION: The camera is equipped with a passive focus detector 31 receiving subject luminous flux so as to detect a focus and detecting the position of a focusing lens set in a focused state as a passive focused lens position, and a contrast focus detection means detecting the position of the focusing lens where the peak of the contrast of a subject image formed by a photographic lens 11 is attained as a contrast focused lens position. A CPU (central processing unit) 25 moves the focusing lens 12 to the passive focused lens position detected by the detector 31 and finishes focusing processing when a release switch SWR is turned on before specified time (t) elapses and before operation by the contrast focus detection means is finished after a photometry switch SWS is turned on. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an automatic focus adjustment device for a camera capable of performing focus adjustment by a plurality of methods.
[0002]
[Prior art and its problems]
2. Description of the Related Art Conventionally, an active triangulation method and a passive method are known as focus detection methods in an automatic focus adjustment device of an electronic camera. Further, a phase difference method and a contrast method are known as passive methods.
The active triangulation method measures the distance based on the principle of triangulation by, for example, irradiating an infrared ray to a subject and receiving the reflected light beam with a position detecting element such as a PSD to detect a light receiving position. is there. In this method, since the distance measurement time is short and the distance to the subject is directly obtained, the focus adjustment lens can be extended to the in-focus position at a stretch, so that the focus adjustment processing time is short. However, the active triangulation method has a low ranging accuracy, a small irradiation area of infrared rays, and a fixed irradiation direction, so that a focus detection area is limited, and so-called hollow holes are easily generated.
[0003]
The phase difference method that uses a subject image transmitted through a photographing optical system is a method in which a subject light beam that passes through a photographing optical system and forms a subject image in a predetermined focus detection area is divided into two by a so-called pupil division method to form a pair of subject images. Is projected onto a line sensor, and the phase difference between the pair of projected subject images is detected to determine the defocus amount. Then, the focusing lens is moved so that the absolute value of the defocus amount becomes minimum. This phase difference method has a wide subject distance range in which focus detection is possible. However, the focus detection area in which focus detection is possible is narrow and limited, and focus detection can be performed only in a preset focus detection area.
[0004]
The contrast method using a video signal captured by an electronic camera utilizes the property that the high-frequency component of the video signal in a focused state is the largest for subjects at the same distance. That is, the contrast method detects the high-frequency component of a video signal captured by moving the focusing lens little by little, and determines the position of the focusing lens so that the high-frequency component is maximized. Is possible. However, since contrast is detected while moving the focus adjustment lens little by little while imaging, it takes a relatively long time to determine the peak (focus point), and especially the focus adjustment lens is located far from the in-focus position. In that case, it takes more time.
[0005]
Therefore, an automatic focus adjustment device equipped with a triangulation method and a contrast method (Patent Documents 1 and 2) and an automatic focus adjustment device equipped with a phase difference method and a contrast method (Patent Document 3) have been proposed. .
In the former automatic focus adjustment device, first, the distance is measured by a triangular distance measurement method, and the focus adjustment lens is moved to a focus position. Thereafter, a contrast peak is searched for by the contrast method based on the in-focus position, the peak position is set as an accurate in-focus position, and the peak is moved to the accurate in-focus position.
The latter automatic focus adjustment device first detects the focus by the phase difference method, moves the focus adjustment lens to the in-focus position, and then, based on this position, drives the focus adjustment lens stepwise to the contrast peak by the contrast method. This is a configuration for detecting by detecting.
However, these automatic focus adjustment devices perform focus adjustment processing sequentially in two types even if the user fully presses the release button to avoid missing a photo opportunity, so the AF time lag until the focus adjustment processing is completed. Was too long to miss a photo opportunity.
[0006]
[Patent Document 1]
JP-A-5-210042 [Patent Document 2]
JP 2001-141984 A [Patent Document 3]
JP-A-7-43605
[Object of the invention]
The present invention has been made in view of the above-described conventional technology, and has as its object to provide an automatic focus adjustment device in which a focus detection method is switched according to a shooting situation.
[0008]
Summary of the Invention
In order to achieve this object, the present invention includes a plurality of focus detecting means for detecting a focusing lens position of a photographing optical system by different methods, a lens driving means for moving the focusing lens, and any one of the focus detecting means. A control means for moving the focus adjusting lens to the detected focus lens position via the lens driving means; a first switch means for operating the focus detection means and the lens driving means; And second control means for operating the one focus detection means to detect a first focus lens position when the first switch means is turned on. The other focus detecting means is operated to detect another focus lens position based on the obtained first focus lens position, and the focus adjustment lens is moved to the other focus lens position. When the second switch is turned on before the operation of the second focus detector is completed after the first switch is turned on and before a predetermined time has elapsed, the one focus detection is performed. Moving the focusing lens to the first focusing lens position detected by the means.
According to this configuration, when the second switch is not turned on within a predetermined time after the first switch is turned on, a plurality of focus detecting means operate to detect the in-focus lens position. Can be focused. Further, if the second switch is turned on before a predetermined time elapses after the first switch is turned on, the focusing process is performed based on the detection result of one focus detecting means, so that the focusing is performed in a short time. It becomes possible to do.
The one focus detecting means preferably has a short processing time. For example, a passive focus which receives a light beam of a subject, detects a focus, and detects a first focus lens position where a focus state is achieved as a passive focus lens position. Detecting means. Preferably, the second focus detection means preferably has high accuracy even if the processing time is somewhat longer, for example, the focus adjustment lens position at which the contrast of the subject image formed by the photographing optical system has a peak. Contrast focus detecting means for detecting the focus adjusting lens while moving it via a lens driving means and setting the other focus lens position as a contrast focus lens position.
[0009]
The present invention preferably provides passive focus detection means for receiving a subject light beam, detecting a focus, and detecting a focus adjusting lens position in a focused state as a passive focusing lens position, and a subject image formed by a photographing optical system. Contrast focus detecting means for detecting a focus adjusting lens position at which the contrast of the image reaches a peak and setting the position as a contrast focusing lens position; lens driving means for moving a focus adjusting lens of the photographing optical system; and any one of the focus detecting means Control means for moving the focus adjustment lens to the focus lens position detected by the control means via the lens driving means; and first control means for operating the focus detection means and the lens driving means and the photographing processing by the control means. The second switch means to be executed, wherein the control means, when the first switch means is turned on, Activating the passive focus detection means to detect a passive focus lens position, operating the contrast focus detection means based on the detected passive focus lens position to detect a contrast focus lens position, After the focus adjustment lens is moved to a focusing lens position and the first switch is turned on, before the operation of the contrast detector is completed, and before the predetermined time elapses, the second switch is turned on. When turned on, the focus adjusting lens is moved to the passive focusing lens position detected by the passive focus detecting means.
According to this configuration, when the first operating means and the second operating means are continuously turned on, the focus adjusting lens is moved to the passive focusing lens position obtained by the passive processing, and the focusing processing is completed. Therefore, the time from when the second operation means is turned on to when the focusing process is completed is shortened. In addition, when the time from when the first operating means is turned on to when the second operating means is turned on is longer than a predetermined time, the focus adjusting lens is moved to the position of the contrast focusing lens obtained by the contrast focus detecting means. Therefore, highly accurate focusing processing can be performed.
[0010]
The control means may control the passive focus detection means when the second switch means is turned on before a predetermined time has elapsed, even if the contrast detection means is operating after the first switch means is turned on. Moves the focus adjustment lens to the detected passive focusing lens position.
When the second switch is turned on a predetermined time after the first switch is turned on after the first switch is turned on, an effective passive focusing lens position cannot be obtained by the passive detector. In this case, the position of the focusing lens is detected by the contrast detecting means, and then the focusing lens is moved to the position of the focusing lens.
Practically, the first switch means and the second switch means are constituted by switches which are turned on by half-pressing and fully-pressing the release button of the camera.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will be described below with reference to the drawings. FIG. 1 shows a circuit configuration of an automatic focusing device of a lens shutter type electronic camera as an embodiment to which the present invention is applied.
This electronic camera receives a subject image formed by the photographing lens 11, receives the subject image and converts the subject image into an electric image signal, and processes the image signal output by the CCD 21 as signal processing means. An AFE (Analog front end) 22, a DSP (Digital Signal Processor) 23, an image memory 24, and a CPU 25 are provided. The CPU 25 is connected to a photometric switch SWS and a release switch SWR that are linked to a release button mounted on a camera body (not shown). When the release button is half-pressed, the photometric switch SWS is turned on. When the release button is fully pressed, the photometric switch SWS is kept on and the release switch SWR is turned on. Reference numeral SWM denotes a power switch, and when the power switch SWM is turned on, the CPU 25 is started to be in a state in which the camera can operate such as an automatic focus process and an imaging process.
[0012]
The taking lens 11 includes a focusing lens 12 and a lens shutter unit 13. The focus adjustment lens 12 is formed so as to be movable along the optical axis, and its movement is controlled by the CPU 25 via a focus adjustment lens actuator 26. The lens shutter unit 13 also functions as a shutter and a diaphragm, and the CPU 25 controls the shutter and diaphragm driving via a lens shutter actuator 27.
[0013]
The image signal output from the CCD 21 is amplified by the AFE 22, sampled and held, converted into a digital image signal in pixel units by an A / D converter, and output to the DSP 23. The DSP 23 performs signal processing such as white balance adjustment, blanking, clamping, and gamma correction on the input digital image signal, and writes the processed digital image signal into the image memory 24. Normally, the image memory 24 is a cache memory, and a non-volatile memory card (not shown) is detachably formed as the image memory.
[0014]
Although not shown, the DSP 23 incorporates a digital filter that functions as a high-pass filter, a full-wave detection circuit, and an integration circuit. The digital filter extracts a high frequency component of the input digital image signal. Then, the high frequency component is extracted, and the positive and negative components of the high frequency component signal are aligned in the same direction, detected, and integrated. The integrated detection signal is output to the CPU 25 as contrast data.
[0015]
The CPU 25 inputs contrast data while driving the focusing lens 12 stepwise, and searches for a contrast peak. Then, the position of the focusing lens 12 at which the peak is obtained is determined as the position of the contrast focusing lens (another focusing lens position), and the focusing lens 12 is moved to that lens position. The movement locus of the focusing lens 12 by this contrast method is shown in FIG. In this case, the photographing lens 11, the CCD 21, the AFE 22, the DSP 23, the CPU 25, the focus adjusting lens actuator 26, and the focus adjusting lens 12 constitute and function as contrast detecting means (other focus detecting means).
[0016]
The electronic camera further includes a passive focus detection device 31 as one focus detection unit and passive focus detection unit. The passive focus detection device 31 is a well-known phase difference type AF module. Although not shown in detail, the passive focus detection device 31 includes an imaging lens (pan focus), a separator lens, and a line sensor. A pair of subject light beams pupil-divided by the lens form a pair of subject images on the line sensor. The line sensor converts a pair of subject images into an electric image signal and outputs the signal to the CPU 25.
The CPU 25 calculates the phase difference (interval) between the pair of subject images, calculates the distance to the subject from the phase difference, and further positions the focusing lens 12 (one focus lens position) at which the subject at that distance is focused. ) Is calculated. Then, the focus adjustment lens 12 is moved to that position (see FIG. 2A).
[0017]
2 (A) and 2 (B), the relationship between the lens position and the contrast is shown by a curve, the passive focusing lens position obtained by passive AF is shown by an open circle, and the contrast focusing lens position obtained by contrast AF is shown. Are indicated by black circles. Normally, the contrast is highest at an accurate focusing position, so that the contrast focusing lens position has higher accuracy, and the passive focusing lens position is slightly shifted from the accurate focusing position.
[0018]
Therefore, in this embodiment, the passive AF result and the contrast AF process are selectively used depending on the timing at which the release switch SWR is turned on after the photometry switch SWS is turned on, thereby achieving both high AF accuracy and short AF time lag. I have. The relationship between the timing at which the photometric switch SWS and the release switch SWR are turned on and the AF processing operation will be described with reference to FIG.
[0019]
(1) When the release switch SWR is turned on before the time (passive AF processing time T) required from the start of the passive AF processing to the determination of the lens position after the photometry switch SWS is turned on ((A) in FIG. 1))
The in-focus position is determined by the passive AF, the focus adjustment lens 12 is moved to the passive AF in-focus lens position, and the in-focus control processing is completed. Here, the passive AF processing time T is, for example, a time required until a passive focusing lens position is obtained for a person by the passive distance measuring device 31 in a standard room (immediately before the focus adjustment lens 12 is activated).
[0020]
(2) When the release switch SWR is turned on before the predetermined time t elapses after the start of the contrast AF process after the photometry switch SWS is turned on ((2) in FIG. 3A), first, the passive AF is performed by the passive phase difference detection method. The position of the focusing lens is determined, a position that is a predetermined distance away from the focusing lens position is determined as the contrast AF start position, and the focusing lens 12 is moved to the contrast AF start position.
Contrast AF processing for searching for a contrast peak by moving the focus adjustment lens 12 stepwise from the contrast AF start position to the close side is started. If the release switch SWR is turned on before the predetermined time t elapses during the search processing, the contrast AF processing is stopped, the focus adjusting lens 12 is moved to the passive AF focusing lens position, and the focusing control processing ends. I do.
[0021]
(3) After the light metering switch SWS is turned on, after the contrast AF process is started, and when the release switch SWR is turned on a predetermined time t has elapsed since the light metering switch SWS was turned on ((3) in FIG. 3A).
First, similarly to the condition (2), the position of the passive AF focusing lens is determined by the passive phase difference detection method, and a position a predetermined distance away from the focusing lens position is determined as the contrast AF start position. The focusing lens 12 is moved to the start position.
Contrast AF processing for searching for a contrast peak by moving the focus adjustment lens 12 stepwise from the contrast AF start position to the close side is started. When the peak is detected, the lens position at which the peak is obtained is set as the contrast AF focusing lens position, and the focus adjustment lens 12 is moved to this lens position, thereby ending the focusing control processing.
[0022]
As described above, in this embodiment, when the photometry switch SWS and the release switch SWR are continuously turned on, that is, when the release button is pressed all at once, the in-focus position is obtained only by the passive AF processing, and the passive AF Since the focus control process is completed by moving the focus adjustment lens 12 to the focus lens position, the focus control process is completed in a short time, and the exposure can be started.
[0023]
If an effective passive AF focusing lens position cannot be obtained under the conditions (1) and (2), the present embodiment continues the contrast AF processing to detect a peak, and obtains the peak. Then, the focus adjustment lens 12 is moved to this lens position, and the focus control process is completed. With this processing, it is possible to shoot in a focused state by the contrast AF processing.
[0024]
On the other hand, when only the photometry switch SWS continues to be turned on, that is, when the release button is half-pressed, the contrast AF start position is obtained in a short time by the passive AF process, and the contrast search is performed from this contrast AF start position. Since the contrast peak position is obtained at the start and the focus adjustment lens 12 is moved to that position, highly accurate focusing processing is enabled.
[0025]
In this embodiment, the predetermined time t is made to coincide with the time required to complete the movement of the focus adjustment lens 12 to the passive AF focusing lens position by the passive AF process. The predetermined time t is not limited to this time because it varies depending on the distance. The predetermined time t can be set by, for example, finding the position of a passive focusing lens with respect to a person by a passive distance measuring device 31 in a standard room and actually measuring the time required to move the focusing lens 12 to that lens position. .
[0026]
FIG. 3B shows a relationship between the release button and the AF processing when the passive AF processing time T is longer than the predetermined time t. For example, a dark room, night photography, and the like are applicable.
In this embodiment, when the release button is fully pressed before the predetermined time t has elapsed, that is, when the release switch SWR is turned on, the focus adjustment lens 12 is moved to the passive AF focusing lens position obtained in the passive AF processing (I If the release switch SWR is turned on after the lapse of the predetermined time t, the focus adjusting lens 12 is moved to the position of the contrast AF focusing lens obtained by executing the contrast AF processing to the end, thereby completing the focusing processing (II). , III).
[0027]
The focus adjustment operation based on passive distance measurement and the focus adjustment operation based on contrast detection of the electronic camera will be further described with reference to FIGS. FIG. 4 is a flowchart relating to main processing which is executed when the power switch SWM is turned on. This embodiment is a so-called AF lock mode in which, when the focusing control process is completed after the photometry switch SWS is turned on, the in-focus state is maintained while the photometry switch SWS is on. Also, in this flowchart, only the processing relating to the gist of the present invention is described.
[0028]
When the power switch SWM is turned on, first, initialization processing is performed for hardware and software (S11), and on condition that the power switch SWM is turned on, the loop processing following the check processing of the photometric switch SWS is repeated (S13; YES). , S15 to S21, S13). When the power switch SWM is turned off, a power-off process is executed and the process ends (S13; NO, S23).
[0029]
While the power switch SWM is on, the following loop processing is repeated. First, the state of the photometric switch SWS is checked, and the change from OFF to ON is waited (S15). When the photometric switch SWS is turned on from off (S15; YES), a focusing control process is executed to move the focusing lens 12 to a focusing position (S17). It is checked whether or not the release switch SWR has been turned on (S19). If the release switch SWR is on, the imaging process is performed and the process returns to S13 (S19; YES, S21, S13), and if the release switch SWR is not on, the process returns to S13 (S19; NO, S13).
If the photometric switch SWS is not turned on from off, the focusing control process is skipped and the process jumps to the release switch SWR check process (S15; NO, S19).
[0030]
Next, the focusing control process executed in S17 when the release button is half-pressed and the photometric switch SWS is turned on from off will be described with reference to the flowchart shown in FIG.
[0031]
First, the CPU 25 sets “0” to the flag f_p_or_con (S31). This flag f_p_or_con is a flag for identifying whether or not an interruption due to the release switch SWR is turned on within a predetermined time t after the photometry switch SWS is turned on, and is “0” when there is no interruption, and “0” when there is an interruption. 1 "is set. Note that the interrupt caused by the release switch SWR being turned on is a high-priority hardware interrupt.
[0032]
Subsequently, the release timer is started (S33), passive AF processing is executed, the distance to the subject is obtained, and the position of the focus adjustment lens 12 (passive AF focusing lens position) is calculated (S35). Then, it is checked whether or not an effective distance measurement value is obtained by the passive AF process and the flag f_p_or_con is "1" (S37).
[0033]
When the effective distance measurement value is obtained and the flag f_p_or_con is “1”, the lens adjustment processing based on the passive result, that is, the focus adjustment lens 12 is moved to the passive AF focusing lens position obtained by the passive AF processing ( S37; YES, S43). Here, the case where the flag f_p_or_con is “1” corresponds to a case where the release switch SWR is interrupted before the predetermined time t has elapsed, that is, a case of the condition (1).
As described above, when the release button is pressed all at once and an effective distance measurement value (passive AF focusing lens position) is obtained by the passive AF, the focus adjusting lens is moved to the passive AF focusing lens position obtained by the passive AF processing. Since the focusing process is completed by moving the lens 12, the AF time lag is reduced.
[0034]
If an effective distance measurement value cannot be obtained, or if the flag f_p_or_con is not “1” (S37; NO), a lens extension process is performed (S39), a contrast AF process is performed, and a contrast AF process is performed. The focus adjustment lens 12 is moved to the detected contrast AF focusing lens position (S41), and the process returns.
[0035]
The case where the flag f_p_or_con is not “1” in S37 is, for example, a case where there is no interruption due to the release switch SWR being turned on before the predetermined time t has elapsed, and corresponds to the condition (2) or the condition (3). In this case, in the lens extension process (S39), the focus adjustment lens 12 is moved from the position of the passive AF focusing lens obtained by the passive AF process to the position of the contrast AF start on the infinity side by a predetermined amount.
[0036]
The case where the effective distance measurement value was not obtained in S37 means that the phase difference could not be detected, for example, when the subject had a low contrast, a repetitive pattern, or the like, or an invalid phase difference or the subject distance Is detected. In this case, in the lens extension process (S39), the focus adjustment lens 12 is moved to the initial position (focusing position at infinity). If the effective distance measurement value is not obtained in S37, the contrast AF process is executed regardless of the interrupt timing of the release switch SWR, so that a highly accurate focusing process can be performed.
[0037]
The contrast AF process executed in S41 will be further described with reference to FIG. When entering this process, the focus adjustment lens 12 has been moved to the contrast AF start position or the infinity in-focus position by the process of S41. In this process, the CCD 21 is driven to take an image, contrast data is input from the DSP 23, and the position of the focusing lens 12 is stored (S51). Next, it is checked whether an effective distance measurement value has been obtained and the flag f_p_or_con is "1" (S53).
[0038]
If an effective distance measurement value is obtained and the flag f_p_or_con is “1”, the lens adjustment processing based on the passive result, that is, the focus adjustment lens 12 is moved to the lens position obtained by the passive AF processing (S53; YES, S61). Here, when the flag f_p_or_con is “1”, the condition (2) is satisfied when the release switch SWR is interrupted before the predetermined time t elapses after the passive AF process.
[0039]
If an effective distance measurement value cannot be obtained or the flag f_p_or_con is not "1"(S53; NO), it is checked whether or not the maximum contrast amount has been obtained (S55). If the maximum contrast amount has not been obtained, the focus adjustment lens 12 is moved by one step, and the process returns to S51 (S55; NO, S57, S51). The above loop processing of S51 to S57 is repeated until a contrast peak is obtained or the flag f_p_or_con becomes “1”. Here, when the flag f_p_or_con is not “1”, there is no interruption due to the release switch SWR being turned on before the predetermined time t has elapsed, and the condition (3) applies.
When the maximum contrast amount is obtained, the focusing lens 12 is moved to the lens position where the maximum contrast amount (contrast peak) is obtained (S55; YES, S59, RETURN).
[0040]
Further, in the present embodiment, the interruption due to the release switch SWR being turned on is permitted between S33 to S39 and S51 to S57. This interrupt processing will be described with reference to the flowchart shown in FIG.
When an interrupt by the release switch SWR is input, first, it is checked whether the release timer is less than a predetermined time t (S71). If it is less than 1, the flag f_p_or_con is set to “1” and the process returns (S71; YES, S73). If not, the flag f_p_or_con is set to “0” and the process returns (S71; NO, S75).
[0041]
【The invention's effect】
As described above, according to the present invention, when the first switch is turned on and then the second switch is turned on, first, based on the focusing lens position determined by the passive phase difference method capable of performing focusing in a short time. The precise focusing lens position is determined by the contrast method, and the focusing lens is moved to the focusing lens position, so that the focusing processing with high precision can be performed, and the first switch and the second switch are continuously operated. When it is turned on, the focus adjustment lens position is moved to the focusing lens position determined by the passive phase difference method that is completed in a short time, so that the AF time lag is shortened, and the chance of taking a shutter is not missed.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a circuit configuration of an automatic focusing apparatus of a lens shutter type electronic camera according to an embodiment of the present invention.
FIG. 2 is a graph showing a relationship between a focus position and a contrast based on a passive AF result in the electronic camera.
FIG. 3 is a graph showing a relationship between a lens movement locus and an in-focus position by contrast AF in the electronic camera.
FIG. 4 is a flowchart showing a main part of a main process of the electronic camera in a flowchart.
FIG. 5 is a flowchart showing a focusing control process in the main process.
FIG. 6 is a flowchart showing a contrast AF process in the focusing control process.
FIG. 7 is a flowchart showing an interruption process by turning on a release switch in the focusing control process and the contrast AF process.
[Explanation of symbols]
11 shooting lens 12 focusing lens 13 lens shutter unit 21 CCD
22 AFE
23 DSP
24 image memory 25 CPU
26 Actuator for Focus Adjustment Lens 27 Actuator for Lens Shutter 31 Passive Focus Detector f_p_or_con Flag

Claims (6)

A plurality of focus detection means for detecting the focus lens position of the photographing optical system in different ways; a lens drive means for moving the focus adjustment lens; and the focus control means for detecting the focus lens position detected by any one of the focus detection means. Control means for moving the adjusting lens via the lens driving means; first switch means for operating the focus detection means and the lens driving means; and second switch means for executing a photographing process. ,
When the first switch means is turned on, the control means operates the one focus detection means to detect a first focus lens position, and uses the detected first focus lens position as a reference. Activating the other focus detection means to detect another focus lens position, move the focus adjustment lens to the other focus lens position,
When the second switch is turned on after the first switch is turned on and before the operation of the second focus detector is completed, and before the predetermined time elapses, the one focus detector is turned on. Moving the focus adjustment lens to the first focus lens position detected by the camera. The one focus detection unit is a passive focus detection unit that receives a subject light beam, detects a focus, and detects a first focusing lens position to be in a focused state as a passive focusing lens position, and the second focus detection unit includes: The focus detection means detects the position of the focus adjustment lens at which the contrast of the subject image formed by the photographing optical system reaches a peak while moving the focus adjustment lens via the lens driving means, and detects the other focus lens. 2. The automatic focus adjusting device for a camera according to claim 1, wherein the position is a contrast focus detecting unit that sets a position as a contrast focusing lens position. Passive focus detection means for receiving a subject light beam to detect a focus and detecting a focus adjusting lens position at which a focused state is obtained as a passive focusing lens position, and a focus at which the contrast of the subject image formed by the photographing optical system has a peak A contrast focus detection unit that detects an adjustment lens position while moving the focus adjustment lens via a lens drive unit and sets a contrast focus lens position, and a lens drive unit that moves a focus adjustment lens of the imaging optical system; Control means for moving the focus adjusting lens to the focus lens position detected by any one of the focus detection means via the lens driving means; and a first means for causing the control means to operate each focus detection means and lens driving means. Switch means and a second switch means for executing a photographing process,
The control means, when the first switch means is turned on, activates the passive focus detection means to detect a passive focus lens position, and based on the detected passive focus lens position, controls the contrast focus position. Activating the detecting means to detect the position of the contrast focusing lens, moving the focusing lens to the position of the contrast focusing lens,
When the second switch is turned on after the first switch is turned on and before the operation of the contrast detector is completed and before a predetermined time has elapsed, the passive focus detector detects the signal. An automatic focusing device for a camera, wherein the focusing lens is moved to a position of a passive focusing lens. 4. The automatic focusing apparatus for a camera according to claim 2, wherein after the first switch is turned on, even if the contrast detection is in operation, the control means controls the first focus before a predetermined time elapses. 5. An automatic focus adjusting device for a camera for moving the focus adjusting lens to a passive focusing lens position detected by the passive focus detecting means when the second switch means is turned on. 4. The automatic focusing apparatus for a camera according to claim 2, wherein the control unit turns on the second switch unit a predetermined time after the first switch unit is turned on. 5. When the effective passive focusing lens position is not obtained by the passive detecting means, the contrast detecting lens position is detected by the contrast detecting means, and the focus adjusting lens is moved to the contrast focusing lens position. Automatic focusing device for camera. 6. An automatic focusing apparatus for a camera according to claim 1, wherein said first switch means and said second switch means are switches which are turned on by half-press and full-press of a release button of the camera. Automatic focusing device for camera.

Images