JP3405114B2 - Optical device with shake detection function - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device such as a camera and binoculars having a blur detecting function, and more particularly to an optical device with a blur detecting function provided with blur amount detecting means for obtaining a blur amount.

[0002]

2. Description of the Related Art An angular velocity sensor and an optical sensor are conventionally known as shake amount detecting means.

The angular velocity sensor detects the angular velocity when the camera body vibrates due to camera shake, and the actual amount of blur is obtained by calculation from the detected angular velocity value. On the other hand, the optical sensor is a CCD (charge coupled de
vice) is used to optically observe the actual movement amount of the subject and use this as the blur amount.

When the blurring amount is obtained by the angular velocity sensor, the blurring amount is obtained by calculation from the angular velocity of the camera body as described above. Therefore, the blurring amount obtained is only the blurring amount of the camera itself (hand shake amount). Is. That is, it has no ability to detect the amount of blur of the subject, and therefore cannot correct the blur of the subject itself.

When the blur amount is obtained by the optical sensor,
As described above, since the amount of movement of the subject is directly obtained (that is, the amount of movement of the subject relative to the camera is obtained), the total amount of blur that includes not only the amount of camera shake but also the subject itself is included. The blurring amount can be detected and the blurring correction can be performed.

As described above, the blur amount detecting means is
It is advantageous to use an optical sensor rather than an angular velocity sensor. When the amount of blur is detected using an optical sensor (for example, CCD), it is common to use a partial area of the entire detection area of the CCD. For example,
The calculation time or the release time lag can be reduced by dividing the detection area on the CCD into a plurality of blocks (blurring amount detection blocks) and detecting the blurring amount in one block selected from the blocks. However, in selecting one of these blocks, there have been the following problems from the prior art.

In this selection, the contrast value (or proper contrast value) of each divided block is obtained, and when a block having a contrast value equal to or higher than a predetermined reference value is found, blur amount detection is executed in the block. Was. However, the main subject (the subject that the user is trying to capture) does not always exist in a block having a contrast value equal to or higher than the reference value. In order to detect the blur of the main subject, it is desirable to select a detection area in the main subject region, but the main subject region cannot be predicted with a high probability only by the blur detection contrast information. Then, if the main subject does not exist in the selected blur amount detection block, the main subject becomes a failed photograph in which the main subject is blurred.

[0008]

Therefore, a technical problem to be solved by the present invention is that in an optical device having a blur detection function, the probability that the region in which the main subject exists and the selected blur amount detection block match. (That is, increasing the probability that the blur of the main subject is corrected and decreasing the probability that a failed photo will occur).

[0009]

[Means, Actions, and Effects for Solving the Problems] The present invention was devised to effectively solve the above-mentioned problems.
Rather than fixing so that one predetermined block is always unconditionally selected as the first block for obtaining the contrast value, a block including an area in which the main subject is predicted to be present by the multipoint distance measuring means is selected. This is a block for selectively determining the first contrast value.

The term "contrast value" in this specification means not only a contrast value obtained by integrating the difference in brightness between adjacent pixels in each block, but also a predetermined calculation from the contrast value. This is a concept that also includes an appropriate contrast value obtained through the above. The appropriate contrast value is a parameter that indicates the blur amount calculation accuracy of a block, and a block having a higher appropriate contrast value is more suitable as a blur amount detection block. For example, in the case where the direction of the luminance distribution in a block is represented as a vertical line and in the case where it is represented as a diagonal line, the former is the latter even if the contrast is the same. It is inferior to Therefore, the contrast suitability value is based on the contrast including the direction of the luminance distribution.

The optical device with the blur detection function of the present invention has a plurality of distance measuring areas in the photographing screen, and compares the measurement data obtained from each distance measuring area to select one distance measuring area. Distance measuring means; and optical blur amount detecting means having a blur amount detecting area in at least a part of the photographing screen. Then, the contrast value is sequentially obtained in a predetermined order for any blur amount detection block in the blur amount detection area, and the blur amount of the subject is detected in the block in which the contrast value that is equal to or higher than the predetermined reference value is first obtained. It In the optical device of the present invention, the blur amount detection area is divided into a plurality of sections, and at least a part of each of the distance measuring areas is included in any section. Further, the block selection means is provided for selecting a block of the blur amount detection area including the distance measurement area selected by the multi-point distance measurement means as a block for which the contrast value is first obtained.

In the present invention, each distance measuring area is preferably completely included in any of the sections,
As described above, at least a part thereof may be included in the compartment. If a range-finding area completely included in a section is selected by the multi-point range finding means, the section is 1
Secondly, it is selected as a block for obtaining the contrast value. Further, when the distance measuring area provided over a plurality of sections is selected by the multipoint distance measuring means, the section including the distance measuring area in the largest area ratio has the first contrast value. It is selected as the desired block. When the multi-point distance measuring unit selects the distance measuring areas included in the plurality of sections in the same area ratio, the priority order may be determined in advance. As described above, in the present specification, the “section including the distance measuring area selected by the multipoint distance measuring means” is a concept including the above.

Since the probability that the main subject actually exists in the area where "the main subject exists" by the multi-point distance measuring means is very high, this allows the blur correction to be performed accurately and efficiently. The probability of being hit is much higher than in the past.

As the multi-point distance measuring means, an active or passive AF module is generally used. In the case of multi-point active AF, a distance is obtained in each distance measuring area, and one distance measuring area is selected by comparing the distance values. In the case of multi-point passive AF, the contrast value of each distance measurement area is calculated and the contrast values are compared to select one distance measurement area, and then the distance value is calculated from the contrast value in the distance measurement area. Alternatively, one distance measuring area is selected by obtaining a distance value from each contrast value for each distance measuring area and comparing the distance values. Therefore, in the present specification, “measurement data” obtained from the distance measuring area means
This is a concept that includes both the contrast value and the distance value.

Further, a CCD is used as an optical blur amount detecting means.
When a module having the above is used, the CCD can be used as a passive multi-point distance measuring means. That is, in the present invention, it is possible to realize the optical shake amount detecting means and the multi-point distance measuring means by one device.

In the optical device with a blur detection function of the present invention, when the block selected by the block selecting means cannot obtain a contrast value equal to or higher than the reference value, the block exists at a position slightly shifted. It is preferable to further include a shift unit that selects the neighboring block group as a block for obtaining a contrast value from the second time to a predetermined number of times.

[0017]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although a still camera will be described below as an example, it goes without saying that the present invention is also applicable to optical devices such as video cameras and binoculars.

FIG. 1 is a front view schematically showing a camera 1 according to an embodiment of the present invention. The blur amount detection module 4 detects the blur amount of the subject with respect to the camera, and the correction lens system is driven relatively to the photographing optical system in a direction of canceling the detected blur amount. The correction lens system and the photographing optical system (both not shown) are arranged inside the lens barrel 2, and the correction lens system is arranged in front of the photographing optical system. Also,
A multipoint AF module 5 is arranged between the blur amount detection module 4 and the finder 3.

FIG. 2 is an explanatory view showing the relationship among the photographing screen, the blur amount detection area, and the AF area (distance measuring area) in the camera of the present invention, and FIG. 3 is the blur amount detection area and AF area. It is explanatory drawing which expands and shows. A part of the shooting screen serves as a blur amount detection area, and in the illustrated example, it is divided into 15 (3 × 5) sections. Within three sections of the center of these _{(S 22, S 23, S} 24), AF area 22, 23, 24 respectively are set. The blur amount detection area is an area on the photographing screen observed by the CCD 40 of the blur amount detecting module 4 described later, and the AF area is an area on the photographing screen observed by the multipoint AF module 5 described later. is there. It should be noted that the size of this section is determined so as to include the minimum number of pixels required to measure the blur amount of the subject on the blur amount detection area.

FIG. 4 shows a three-point distance measuring type AF module used as the multipoint AF module 5. FIG. 4A is a front view of the AF module 5, and FIG.
FIG. 4B is a sectional view taken along line bb of FIG. AF module 5
Is a passive type and has three sets of sensors A ₁ , A ₂ and A ₃ . Each sensor is composed of two pixel portions 52 of a CCD package 51, and a fixed separator lens 53 is arranged in front of it. The sensors A ₁ , A ₂ and A ₃ respectively measure the contrast values of the three AF areas 22, 23 and 24 in the shooting screen, and calculate the distance to the subject by calculation based on these contrast values (measurement). Distance).

As the multi-point AF module, the active type shown in FIG. 5 can also be used. AF
The module 5'is a light projecting section arranged at a predetermined interval.
5 is a front view of the AF module 5 ', and FIG. 5 (b) is a sectional view taken along the line bb of FIG. 5 (a). The light emitting unit 61 has three LEDs 63,
The light receiving unit 66 has three PSDs 68, the LED 63 is arranged on the substrate 62, and the PSD 68 is arranged on the PSD package 67. Fixed lenses 64 and 69 are arranged in front of the LED 63 and the PSD 68, respectively. 3 sets of sensors B each consisting of LED 63 and PSD element 68
₁ , B ₂ , B ₃ are three A's in the shooting screen due to the principle of triangulation.
Find the distance to the subject in F area 22, 23, 24
(Distance measurement).

As described above, the distance measurement is performed in the three AF areas on the photographic screen, and one of the AF areas is assumed to be the main subject, and the focus is set on this area (that is,
By comparing the measurement data of the three AF areas,
One of them will be selected). The method of this assumption is arbitrary, and it may be determined that “the closest subject is assumed to be the main subject”, and the subject may be the second closest subject or the farthest subject. Further, this assumption may be changed by a mode switching operation of the camera or may be fixed for each model of the camera.

In the case of multi-point active AF, each A
A distance is obtained in the F area, and one AF area is selected by comparing the distance values. Further, in the case of multi-point passive AF, one AF area is obtained by calculating the contrast value of each AF area and comparing the contrast values.
One AF area is selected by selecting a region and then obtaining a distance value from the contrast value in the AF region, or by obtaining a distance value from each contrast value for each AF region and comparing the distance values. .

FIG. 6 shows the blur amount detection module 4. FIG. 6 (a) is a vertical sectional view of the module shown in FIG. 6 (b).
Shows a horizontal sectional view. Shake amount detection module 4
Has a CCD package 40 and a fixed lens 42 arranged in front of the CCD package 40. The fixed lens 42 is sandwiched between a holder 43 on the lower side and a lid member 44 on the upper side in the camera body. It has been incorporated. As the fixed lens 42, a bright lens having a small f value is used in order to achieve space saving. The holder 43 and the lid member 44 are formed with a large number of chevron-shaped portions for preventing harmful light. CCD pixel section
41 is covered with a protective glass plate 45.

The CCD observes the blur amount detection area shown in FIGS. 2 and 3, and the contrast value can be measured in an arbitrary block on the area (thus, the CCD is used to measure the contrast value). It can also be used in combination with a passive type multi-point AF module). The block here is an arbitrary partial area for the entire blur amount detection area, and its shape and area can be freely set (that is, a “block” is a concept different from a “section”). is there.). The block is, for example, the area 27 indicated by a broken line in FIG. 3, and can be set at a position deviated from the section of 15.
Further, the shape (or area) thereof can also be set as one that can overlap the section or that has a shape (or spread) different from the section.

The amount of blurring of the subject is detected in one block (blurring amount detection block) in the entire blurring amount detection area. Therefore, it is necessary to select one of the blurring amount detection blocks. In this selection, the contrast value is sequentially obtained in a predetermined order for each predetermined block in the blur amount detection area, and a block having a contrast value equal to or higher than a predetermined reference value (such a block is referred to as an “appropriate block”). When it is first discovered, the shake amount detection is executed in the appropriate block.

The order in which the contrast values are sequentially obtained in order to find an appropriate block is not specified in particular, but conventionally it was fixed and uniform as follows. For example, when the blur amount detection area is divided into 15 sections as shown in FIG. 3, first, the contrast value is sequentially obtained for each section in the horizontal direction from the section S ₁₁ , and then in the horizontal direction from the section S _21. ,
Then, finally, in order from the section S ₃₁ to each section in the horizontal direction. And this order is the same in any case and is not changed. Therefore, considering the case where the main subject exists in the section S ₂₃ as shown in FIG. 2, the contrast value is required 8 times before the suitable block is found, which is disadvantageous in terms of time and energy. Is. If the contrast value of the section S ₁₁ in FIG. 2 is greater than or equal to the predetermined reference value,
(Ie if section S ₁₁ is a proper block), section S
_{Since the} amount of blurring is detected in ₁₁ , the blurring of the main subject cannot be corrected.

On the other hand, in the present invention, the AF module of the multi-point distance measuring system (in the illustrated example, there are three,
(It is needless to say that the present invention is not limited to this), and a section including an area predicted by the AF module that "the main subject exists" is selected as a block for obtaining the contrast value for the first time. . Therefore, the probability that the area where the main subject is present is appropriately selected as the blur amount detection block is increased, and the number of times the contrast value is calculated can be surely reduced.

FIG. 7 is a block diagram for explaining the camera of the present invention.

The camera of the present invention is preferably provided with two CPUs for controlling the camera. That is, a CPU that performs calculation related to shake correction that requires high speed
2 and a CPU 1 that performs calculations for general camera control
Separately from the above, a high-speed and expensive one is adopted only for the CPU 2, and a relatively low-cost one is adopted for the CPU 1. As a result, it is possible to realize a total cost reduction as compared with the case where all calculations are performed using one large-scale high-speed CPU.

The CPU 1 mainly performs calculations other than the shake correction, and controls the multi-point distance measuring means and the photometric means as shown in FIG. 7 and other well-known means as shown in the drawing. . On the other hand, the CPU 2 is a means for performing calculations mainly relating to blurring correction and displaying a blurring amount detecting means, a blurring correcting means, and a blurring displaying means (a size and a direction of the detected blurring so that the user can recognize them). For example, the LEDs arranged in the finder are controlled. The signal specifying the AF area selected by the multi-point distance measuring means is CP
It is sent to the blur amount detecting means via U1 and CPU2.

In the blur amount detection module, multi-point A
The first contrast value calculation is performed in the section including one AF area selected by the F module. That is, when the AF area 22 is selected, the section S
The first calculation is performed at ₂₂ , and similarly the AF area
In compartment S ₂₃ if 23 is selected, AF area 24
If is selected, in section S ₂₄ , the first
The second calculation is performed. In general, the probability that the main subject actually exists in the area where the “main subject exists” by the multipoint AF module is very high (that is, the probability that the section is an appropriate block is very high).
Therefore, as a result, the probability that the blur correction will be performed accurately and efficiently will be much higher than in the past. However, since this is a probabilistic problem, it is possible that the partition is judged not to be an appropriate block as a result of the first calculation of the contrast value. In this case, 2
The order in which the contrast value calculation is performed in the blocks after the first calculation is arbitrary, but as described below, the second and subsequent blocks in the block group existing in the vicinity of the partition in which the first calculation is performed. It is preferable to calculate the contrast value of. In this case as well, the order is not particularly limited, but will be described below by taking an example.

In FIG. 8, when the first calculation of the contrast value is performed in the section S ₂₃ , and as a result, it is determined that the section is not a proper block, the second and subsequent calculation of the contrast value is performed. It illustrates how to do it in blocks. Here, it is assumed that each section is composed of M × N (pieces) pixels.

The first calculation of the contrast value is section S
₂₃ is performed in a block (n = 1) corresponding to ₂₃ , and when the contrast value of the block (n = 1) is smaller than a predetermined reference value but is close to the reference value to some extent (or the same reference value). If it is smaller than that, unconditionally), the contrast value is calculated in the block (n = 2) at a position shifted by n pixels in the horizontal direction and m pixels in the vertical direction from the block (n = 1). Similarly, the contrast value is sequentially calculated in the blocks at the shifted positions to search for an appropriate block. However, rather than keep looking in the vicinity of the compartment S ₂₃ to the proper block is found, give up defines the appropriate conditions in the case of also looking to some extent can not find the appropriate block. This procedure is shown in the flow chart of FIG.

A selected by the multipoint AF module
When a signal specifying a section including the F region is sent to the blur amount detection module, the first calculation of the contrast value X is performed in the section (step S1), and the obtained X is a predetermined reference value. It is determined whether or not A or more (step S2). When X is equal to or larger than the reference value A, it is considered that the blur amount calculation accuracy is excellent, and thus the section is determined as the block for executing the blur amount detection (step S2 →
S9).

When the contrast value X obtained in step S1 is smaller than A, X is another predetermined reference value B.
It is compared with (B <A) (step S3). When X is B or more (that is, smaller than the reference value A but close to A to some extent), it is considered that there is a high probability that a block having a contrast value of the reference value A or more exists near the partition. Therefore, the process proceeds to step S4 to search for a block having an appropriate value of A or more in the vicinity of the section. Also,
In step S3, the calculated contrast value is B
If it is smaller than that, it is considered that there is a low probability that a block having a contrast value equal to or higher than the reference value A is present in the vicinity of the block. Go to.

When X is B or more, the number of pixels of m pixels in the horizontal direction from the section where the contrast value is first obtained,
A block existing at a position shifted by n pixels in the vertical direction is provisionally set as a blur amount detection block (step S4), and a contrast value X is obtained in the block.
(Steps S4 → S5 → S1). Here, until the cumulative amount of horizontal or vertical displacement reaches one section, S
By repeating the loop of 4 → S5 → S1 → S2 → S3 → S4, the proper value of the block at the sequentially shifted position is measured, and when the block having the proper value of A or more is found, the blur amount of the block is detected. Is determined as a block to be executed (steps S2 → S9). However, if there is a block whose proper value is smaller than B even once even during that time, the process proceeds to step 7 at that time.

The cumulative total of shift amounts in the horizontal or vertical direction is 1
When the number of divisions is reached, abandoning the search for an appropriate block from blocks near the division where the main subject is assumed to exist by the multipoint AF module, and "subject blur detection failure"
Is displayed in the viewfinder with an LED (or a sound) (step S6), and another section is selected to obtain its contrast value (step S7). This means that the detection of the image blur of the main subject is abandoned at this point, and thereafter only the camera shake of the camera itself is detected. next,
The contrast value obtained in step S7 is compared only with the reference value A (step S8), and if it is equal to or larger than the reference value A, the process proceeds to step 9 (that is, this section is used as a block for executing the blur amount detection). decide). If the contrast value is smaller than A, another section is selected and similarly the appropriate value in that section and the reference value A are sequentially compared (steps S8 → S10 → S7). When the contrast value of A or more is not obtained for all the sections, the amount of blurring is completely abandoned (meaning that the amount of blurring is not detected at all, not only the image blur but also the camera shake). To warn that "blurring cannot be detected" (step S
8 → S10 → S11). At this time, the user takes a picture without giving up on the shake correction at all, or changes the angle to put the release button in a half-pressed state again. In this case, the shutter may not be released even if the release button is pressed.

Alternatively, step S3 may be omitted, and if it is determined in step S2 that X is smaller than A, the process may unconditionally proceed to step 4. In this case, when the contrast value X obtained in the first section is smaller than the reference value A, an appropriate block is unconditionally searched for in the vicinity of the section without comparing X with B. In addition, the order when selecting other sections in step S7 can be appropriately determined.

In the example shown in the flow chart of FIG. 9, in step S5, the detection of the image blur is abandoned when the cumulative total of the shift amounts in the horizontal direction or the vertical direction reaches one section. However, this is only an example of a time-out when continuing to search for a proper block from the block group in the vicinity when the partition for which the contrast value is obtained for the first time is not the proper block. Therefore, the process may proceed to step S6 when the cumulative amount of the horizontal or vertical shift amount reaches a half-division, and other conditions can be defined (for example, not only the number of pixels shifted but also the number of shift pixels). You may set the deadline based on the number of times you did).

Further, the shifting direction can be arbitrarily set, which may be unconditionally set uniformly, or may be controlled based on the contrast value measured by the CCD. . For example, the section for which the contrast value is obtained for the first time is further divided into four subsections, the contrast value is obtained for each, and the section is shifted toward the subsection for which the highest contrast value is obtained. Can also be considered. However, when the contrast value X is compared with the reference value A or B, the calculation of the contrast value X is performed not in the small blocks but in the blocks having the same area as the blocks. Furthermore, the block shift may be a spiral shift instead of the linear shift shown in FIG.

10 to 11 show the camera of the present invention,
The overall flow from the state in which S ₁ is turned on and the preparation for photographing to the completion of photographing is shown in a flowchart. Figure 9
The flowchart shown in corresponds to step S25.

When S ₁ is turned on and a shooting preparation signal is issued (step S20), multipoint distance measurement is performed by the three-point AF module (step S21), and measurement data is obtained in three AF areas on the shooting screen. Desired. It should be noted that what is shown is an example of passive AF, and in the case of active AF, steps S22 and S40 do not exist.

By comparing the measurement data from the three areas, one AF in which the main subject is considered to exist
A region is selected (step S23). That is, it is assumed that the main subject exists in the AF area. Passive A
When F is used, if a sufficient contrast value for distance measurement cannot be obtained in any of the three AF areas, "low-con (that is, AF impossible)" is warned and the process returns to the start ( Steps S22 → S40 → S20). When the active AF is used, the contrast value is not necessary for distance measurement, and therefore the process always proceeds from step S21 to step S22 to step S23.

When one AF area is selected in step S23, as described with reference to the block diagram of FIG. 7, a signal specifying a section including the AF area is sent to the blur amount detection module ( Step S24). After that, as described with reference to the flowchart of FIG. 9, the block for which the blur amount detection is executed is determined (step S25). Then, the release start signal S ₂ is awaited while continuing the blur amount detection in the determined block (steps S27, 28). However, if the determination of the blur amount detection block has been abandoned
(A warning is given in this case), and the blur amount is not measured at this time (steps S26 → S28).

The release start signal S ₂ is detected and it is determined whether or not the flash is emitted (step S 2
9). If the flash is not required, the lens extension is started based on the distance measurement result (step S30), and the blur correction is started based on the blur amount detection result within a predetermined time after the start of extension (step S31). However, when it is determined that the blur correction is not necessary based on the photometric result and the focal length of the photographing lens, the blur correction is not performed. Finally, exposure is performed (step S32), and when the exposure is completed, the blur amount detection and blur correction are stopped (step S33).

If it is determined in step S29 that flash light emission is necessary, it is determined whether the mode is the shake correction required mode (step S34). Basically, the shake correction is not necessary when the flash is emitted, but the shake correction is performed in a specific mode such as slow sync that satisfies the background exposure to some extent. If you need image stabilization,
The process proceeds to step S30, and shake correction is performed in the same manner as when the flash is not needed. If the shake correction is not necessary, the shake amount detection is stopped, and then the lens is extended and exposed (steps S35 → S36 → S37).

In the embodiment described above, each AF
Regions ₂₂ , ₂₃ , ₂₄ are completely contained within compartments S ₂₂ , S ₂₃ , S ₂₄ , respectively. However, either A
It is also possible to provide the F area or all the AF areas so as to extend over a plurality of sections. Such AF
When the area is selected by the multi-point AF module, the partition that includes the AF area in the largest area ratio may be selected as the block for which the contrast value is first determined. Further, when the AF area is included in a plurality of sections at the same area ratio, the priority order may be set in advance for each section including the AF area.

[Brief description of drawings]

FIG. 1 is a front view of a camera according to the present invention.

FIG. 2 is an explanatory diagram showing a relationship among a shooting screen, a blur amount detection area, and an AF area in the camera of FIG.

FIG. 3 is an enlarged explanatory view for enlarging and explaining a blur amount detection area and an AF area in FIG.

4A and 4B are a front view and a cross-sectional view illustrating a passive-type three-point distance measuring AF module used in the camera of FIG.

5A and 5B are a front view and a cross-sectional view illustrating an active type three-point distance measuring AF module that can be used instead of the AF module in FIG.

6A and 6B are a vertical cross-sectional view and a horizontal cross-sectional view illustrating a blur amount detection module used in the camera of FIG.

FIG. 7 is a block diagram illustrating a camera of the present invention.

FIG. 8 is an explanatory diagram showing an example of a proper block search process.

FIG. 9 is a flowchart illustrating a procedure for searching an appropriate block.

FIG. 10 is a flowchart illustrating the entire shooting procedure of the camera of the present invention.

FIG. 11 is a flowchart illustrating the entire shooting procedure of the camera of the present invention.

[Explanation of symbols]

1 camera 2 lens barrel 3 finder 4 Blurring amount detection module 5 Multi-point AF module (passive type) 6 AE module 7 Release button 22, 23, 24 AF area 27 blocks 40 CCD package 41 CCD pixel unit 42 Fixed lens 43 holder 44 Lid member 45 glass plate 51 CCD package 52 CCD pixel section 53 Fixed separator lens 61 Emitter 62 LED package 63 Light emitting part (LED) 64 Fixed lens (projector) 66 Receiver 67 PSD Package 68 Light receiving part (PSD) 69 Fixed lens (light receiving part)

Continuation of the front page (56) Reference JP-A-9-318988 (JP, A) JP-A-6-343160 (JP, A) JP-A-4-349439 (JP, A) JP-A-2-116810 (JP , A) JP-A-1-264372 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03B 5 / 00,17 / 00 H04N 5 / 222-5 / 257

Claims (2)

(57) [Claims] 1. A multi-point distance measuring means having a plurality of distance measuring areas in a photographing screen, comparing measurement data obtained from each distance measuring area and selecting one distance measuring area, and at least a photographing screen. An optical blur amount detection means having a blur amount detection area in a part of the area is included, and a contrast value is sequentially obtained in a predetermined order for an arbitrary blur amount detection block in the blur amount detection area, and a predetermined reference value is set. An optical device with a blur detection function, which is configured to execute a blur amount detection of a subject in a block in which the above contrast value is first obtained, in which the blur amount detection area is divided into a plurality of sections, At least a part of each of the range-finding areas is included in any section, and the section of the blur amount detection area including the range-finding area selected by the multi-point range-finding means is set to the first contrast value. Request Characterized by comprising a block selecting means for selecting as that block, shake detection function optical device. 2. When a block selected by the block selecting means cannot obtain a contrast value equal to or higher than the reference value, a neighboring block group existing at a position slightly shifted from the reference block is predetermined from the second time. The optical device with a blur detection function according to claim 1, further comprising shift means for selecting as a block for obtaining a contrast value up to the number of times.