JP2001024931A - Image pickup unit and solid-state imaging element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve focusing precision while avoiding the generation of a moire by detecting a focus by means of the high frequency component of an image signal obtained by means of photoelectrically converting the image which does not pass through an optical low-pass filter. SOLUTION: A holding means 305 for an infrared cut glass 303 and a cover glass 304 is arranged. Besides, a focus lens 1F is constituted to be moved forward and backward by the driving motor 16M of a focus driving circuit. That is, in this case, the optical low-pass filter is not disposed at the side of the light receiving surface of an imaging device 3. Then auto-focusing is executed by using the high frequency component being close to a limit in the neighborhood of a Nyquist frequency in this example though automatic focusing is executed by the high frequency component of a comparatively wide band or the high frequency component of a little high frequency in a conventional manner. Thus, the focus is detected by the high frequency component of the image signal obtained by photoelectrically converting the image which does not pass through the optical low-pass filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an imaging device and a solid-state imaging device for the imaging device, and more particularly to an improvement in focusing accuracy when an image obtained through an imaging lens is received by the solid-state imaging device and handled as digital data. .

[0002]

2. Description of the Related Art An image pickup apparatus such as a digital camera has a configuration in which an image obtained through an image pickup lens is photoelectrically converted by a solid-state image pickup device and an obtained image signal is handled as digital data.

Conventionally, in a camera using a solid-state image sensor (still camera for handling still images and video camera for handling moving images), if the resolution of an imaging lens is higher than a certain level, the distance between individual photosensors of the solid-state image sensor has to be increased. It has been known that due to the periodicity, when the subject is periodic such as a mesh pattern, interference occurs and a false image is generated.

In order to prevent such inconveniences, the image is doubled by utilizing the birefringence of an optical low-pass filter made of a quartz plate or the like, so that the resolving power of the image pickup lens is reduced. The high frequency component of the image is cut to prevent the generation of a false image.

[0005]

By the way, in recent years, the image quality of an imaging device using a solid-state imaging device has been improved,
The number of pixels of the solid-state imaging device has also been increasing.

When performing auto-focusing of the image pickup apparatus, a so-called hill-climbing servo system for monitoring a change in the level of a high-frequency component of a picked-up image signal from the solid-state image pickup element while adjusting the focus is adopted. There is.

In this hill-climbing servo system, it is necessary to monitor a change in the level of a high-frequency component as high as possible in an imaged video signal in order to finally obtain a focal point with high accuracy. Particularly, in recent years, high image quality has been advanced, and therefore, accurate auto focus is required.

FIG. 5 is an explanatory view showing a state in which the focal point is determined by the hill-climbing servo system of the output. The horizontal axis represents the movement position of the focus lens in the optical system, and the vertical axis represents the signal level of the high-frequency component included in the captured video signal.

Here, a relatively low frequency component is converted to a BPF
1 shows a high-frequency component of a loose peak obtained by extracting at 1 and a high-frequency component of a sharp peak obtained by extracting a frequency component higher than BPF1 by BPF2.

In this case, when performing auto focus, first, the focus lens in the optical system is moved to either side, and a signal obtained by filtering an imaged video signal with BPF1 is referred to as M1 → M2 → M3. Find a rough mountain peak,.

Next, the filter is switched to BPF2,
By moving the focus lens in the optical system to either side and referring to the signal obtained by filtering the captured video signal with BPF2, a sharp peak such as M4 → M5 → M6 → M7 is found. Thereby, highly accurate auto focus can be performed.

In this case, as the frequency component of the picked-up video signal becomes higher, the peak of the peak due to the position of the focus lens becomes sharper, so that accurate autofocusing can be performed.

For this reason, the frequency of the high-frequency component (AF sampling frequency) used for autofocusing is increasing, and approaches the Nyquist frequency of the image signal of the solid-state image sensor (FIG. 6 ').

However, it is necessary to execute autofocus in a high-frequency component region where the level is reduced by being greatly attenuated by the above-described optical low-pass filter. That is, it is actually difficult to realize autofocus using a signal in an area where the loss is large and the signal level is small.

Also, the optical low-pass filter cannot be removed because it is necessary to avoid moire. Further, removing the optical low-pass filter not only causes moiré but also necessitates the provision of a new infrared cut filter holding mechanism which has been held integrally with the optical low-pass filter.

Therefore, it is difficult to execute high-precision auto-focusing despite the increase in the number of pixels and the improvement in image quality. The inventor of the present application has newly found that the above-described problems relating to autofocusing occur with higher image quality.

Accordingly, an object of the present invention is to improve the focusing accuracy when an image obtained through an imaging lens is received by a solid-state imaging device and handled as digital data, while avoiding the occurrence of moire. It is an object to realize an imaging device and a solid-state imaging device.

[0018]

As a result of intensive studies on the above-mentioned objects, it has been found that the occurrence of moiré near the Nyquist frequency of an image signal of a solid-state image sensor is suppressed and the AF sampling frequency for autofocusing is obtained. It has been found that it is possible to achieve both the prevention of a nearby level drop. That is, the present invention for solving the above problems is as described below.

(1) According to the first aspect of the present invention, there is provided an image pickup lens constituting an optical system for forming an image of a subject on an image forming surface, and an image pickup lens provided at a position of the image forming surface of the image pickup lens. A solid-state imaging device that photoelectrically converts the obtained image to generate an image signal, a focus detection unit that performs focus detection with reference to a high-frequency component of an imaged video signal obtained by the solid-state imaging device, and a focus detection unit. Focus adjusting means for adjusting the focus of the imaging lens in accordance with the detection result, wherein the focus detecting means focuses on a high-frequency component of an image signal obtained by photoelectrically converting an image that does not pass through an optical low-pass filter. An imaging apparatus for performing detection.

In this image pickup apparatus, focus detection is performed based on the high-frequency component of an image signal obtained by photoelectrically converting an image that does not pass through an optical low-pass filter, so that the level of the high-frequency component of the image signal does not decrease. Therefore, it is possible to perform the focus adjustment with high accuracy.

(2) The invention described in claim 2 is that the focus adjustment means adjusts the focus of the imaging lens to a focus position shifted by a predetermined amount from the focus position detected by the focus detection means. The imaging device according to claim 1, wherein:

In this imaging apparatus, focus detection is performed by using a high-frequency component of an image signal obtained by photoelectrically converting an image that does not pass through an optical low-pass filter, and the level of the high-frequency component of the captured video signal is high without lowering. Accurate focus adjustment can be performed, and since the focus adjustment of the imaging lens is shifted by a predetermined amount, moire does not occur.

It should be noted that the predetermined amount for shifting the focus adjustment is based on the extent to which moiré does not occur or the extent to which the resolving power obtained when a conventional optical low-pass filter is used can be obtained.

(3) The invention according to claim 3, wherein the focus adjustment means shifts the focus position by a predetermined amount from infinity to a short distance side when the focus position detected by the focus detection means is near infinity. The image pickup apparatus according to claim 1, wherein the focal point of the image pickup lens is adjusted to a focal position that has been set.

In this imaging apparatus, focus detection is performed by using a high-frequency component of an image signal obtained by photoelectrically converting an image that does not pass through an optical low-pass filter. Accurate focus adjustment can be performed, and since the focus adjustment of the imaging lens is shifted by a predetermined amount, moire does not occur.

When the focus position is near infinity,
Since the focus adjustment is shifted to the short distance side, the focusing range is expanded as compared with the shift to the far distance side from infinity. (4) The invention according to claim 4, wherein the focus adjustment means is configured to include, when the in-focus positions of a plurality of subjects are detected by the focus detection means, between the plurality of subjects. The imaging apparatus according to claim 1, wherein focus adjustment of a lens is performed.

In this imaging apparatus, focus detection is performed by using a high-frequency component of an image signal obtained by photoelectrically converting an image that does not pass through an optical low-pass filter, and the level of the high-frequency component of the image signal is high without decreasing. Accurate focus adjustment can be performed, and since the focus adjustment of the imaging lens is shifted by a predetermined amount, moire does not occur.

When the in-focus positions of a plurality of objects are detected, the focus is adjusted so as to be between the plurality of objects, so that the in-focus range is widened. (5) The solid-state imaging device is provided at a position of an imaging surface of the imaging lens, and photoelectrically converts an image obtained by the imaging lens to generate an image signal. An infrared cut filter is provided on a light receiving surface of the imaging device, and the infrared cut filter is used as a dust-proof cover glass of the solid-state imaging device.

In this solid-state image sensor, the light receiving surface of the solid-state image sensor can be protected by using the infrared cut glass as the dust-proof cover glass. (6) A solid-state imaging device provided at a position of an imaging surface of an imaging lens and photoelectrically converting an image obtained by the imaging lens to generate an image signal, wherein the solid-state imaging device An infrared cut filter and a dustproof cover glass are provided on the light receiving surface of the element, and holding means for integrally holding the infrared cut filter and the dustproof cover crow are provided.
This is a solid-state image sensor.

In this solid-state imaging device, by holding the infrared cut glass and the dust-proof cover glass integrally,
The light receiving surface of the solid-state imaging device can be protected by using the same holding mechanism as in the related art.

(7) According to a seventh aspect of the present invention, there is provided an imaging apparatus using the solid-state imaging device according to the fifth or sixth aspect as an image receiving means. In this imaging apparatus, the infrared cut glass and the dust-proof cover glass are integrally held, or the infrared cut glass is used as the dust-proof cover glass, so that the solid-state image pickup device can be formed using the same holding mechanism as before. The light receiving surface can be protected.

[0032]

Embodiments of the present invention will be described below in detail. <Configuration of Imaging Apparatus> First, the configuration of the imaging apparatus used in the present embodiment will be described with reference to FIG.

FIG. 1 is a functional block diagram showing an overall schematic electrical configuration of an image pickup apparatus according to an embodiment of the present invention. In the image pickup apparatus shown in FIG.
The optical image obtained through the optical system composed of
An image is formed on the light receiving surface of the image sensor 3 such as D. At this time, the lens 1 and the aperture stop 2 are driven by a focus drive circuit 16 and an aperture drive circuit 15, respectively.

Here, the image pickup device 3 photoelectrically converts the light image formed on the light receiving surface into a charge amount, and outputs an analog image signal by a transfer pulse from the image pickup device driving circuit 19. The noise of the output analog image signal is reduced by CDS (correlated double sampling) processing in the pre-processing circuit 4, the gain is adjusted by AGC, and knee processing for expanding the dynamic range is performed. .

After being converted into a digital image signal by the A / D converter 5, the signal processing circuit 6 performs luminance processing and color processing on the digital video signal (for example, a luminance signal (Y) and a color difference signal ( Cr, Cb)) and output to the memory controller 7.

On the other hand, the signal processing circuit 6 also has a built-in D / A converter, and receives a colorized video signal input from the A / D converter 5 and a reverse input from the memory controller 7. Image data can be output as an analog video signal.

These functions are switched by exchanging data with the main microcomputer 8, and the exposure information, the focus signal, and the white balance information of the image pickup device signal can be output to the main microcomputer 8 as needed.

The main microcomputer 8 is mainly used for photographing,
The sequence of recording and reproduction is controlled, and further, as necessary, compression and reproduction of the photographed image and serial port transmission with an external device are performed. Here, CCITT and IS are used as image compression.
The JPEG method or the JBIG method standardized by O is used.

The memory controller 7 stores the digital image data input from the signal processing circuit 6 in the frame memory 9 or outputs the image data in the frame memory 9 to the signal processing circuit 6.

The frame memory 9 is an image memory capable of storing at least one screen of image data. For example, a VRAM, an SRAM, a DRAM or the like is generally used. Here, a VRAM which can operate independently of a CPU bus is used. are doing.

The image storage memory 10 is a memory built in the main body, and stores image data stored in the frame memory 9 that has been subjected to image compression processing or the like by the main microcomputer 8. As the image storage memory 10,
For example, an SRAM, a DRAM, an EEPROM or the like is used, but an EEPROM is preferable in consideration of storing image data in the memory.

A PC card controller (PCMCIA controller) 11 is a PC memory card (hereinafter simply referred to as PC).
The main microcomputer 8 connects an external recording medium such as a card) to the main microcomputer 8. After the image stored in the frame memory 9 is subjected to image compression processing or the like by the main microcomputer 8, the image is transmitted through the controller 11. Recorded on an external storage medium. An external storage PC card connected via the PC card controller 11 is an SRAM card.
A card, a DRAM card, an EEPROM card, or the like can be used, and image data can be directly transferred to a remote storage medium via a public line using a modem card or an ISDN card.

Light emission timing of the strobe 12 is obtained by the main microcomputer 8 which controls a photographing sequence. The serial port driver 13 performs signal conversion for performing information transmission between the camera body and information between external devices. As the serial transmission means, RS23
There are recommended standards for performing serial communication such as 2C and RS422A, but here, RS232C is used.

The sub-microcomputer 14 controls man-machine interfaces such as operation switches of the camera body and a liquid crystal display, and transmits information to the main microcomputer 8 as necessary. Here, a serial input / output terminal is used for transmitting information to and from the main microcomputer 8. It also has a built-in clock function and controls auto-date.

The aperture drive circuit 15 is constituted by, for example, an auto iris, and changes the aperture value of the optical aperture 2 under the control of the main microcomputer 8. The focus drive circuit 16 is configured by, for example, a stepping motor, and changes the lens position under the control of the main microcomputer 8 to appropriately adjust the optical focus surface of the subject on the image sensor 3. A liquid crystal display unit 18 is connected to the sub-microcomputer 14 and displays various information such as photographing information.

<Basic Operation of Imaging Apparatus> Next, a series of operations for photographing will be described. First, depending on the user,
The operation mode of the camera is set based on various switch information connected to the sub-microcomputer 14, and information for photographing is input to the main microcomputer 8 as serial information.

According to this information, the main microcomputer 8
The memory controller 7 and the serial port driver 13 are set. When the release switch on the sub-microcomputer 14 is pressed, the sub-microcomputer 14 issues a first switch signal S1
Is activated, issues an image input command to the signal processing circuit 6, and the signal processing circuit 6 operates the image sensor 3, the pre-processing circuit 4, and the A / D converter 5 to receive image data.

The received image data is converted into a signal processing circuit 6
After performing basic signal processing, focus information is created from high-frequency components of luminance data, and exposure data is created from low-frequency components.

The main microcomputer 8 reads these data from the signal processing circuit 6 and drives the aperture or
Focus drive and AGC of pre-process circuit 4
The gain of the amplifier is controlled so that proper exposure and focus can be obtained. Further, depending on the operation mode, an analog image signal can be output from the signal processing circuit 6 via the video amplifier 17 as an NTSC video signal.

When the signal indicating that the second release switch signal S2 has been pressed is input from the sub-microcomputer 14 to the main microcomputer 8 after the exposure value and the focus have been adjusted to appropriate values, the main microcomputer 8 It outputs a data capture instruction to the memory controller 7. Also, if necessary, a light emission signal is output to the strobe 12 at the field timing of the captured image. Memory controller 7
Receives a command to capture an image, detects a synchronization signal from the signal processing circuit 6, and captures image data in the Y, Cr, Cb format or the like output from the signal processing circuit 6 at a predetermined timing into the frame memory 9. .

When the image capture to the frame memory 9 has been completed, the memory controller 7 displays a status indicating that the capture has been completed, and the main microcomputer 8 reads the status. Know. After the photographing is completed, the main microcomputer 8 performs image compression as necessary, and transfers the image data to the image storage memory 10, an externally connected IC card, or a personal computer or the like connected to an external serial port. I do.

FIG. 2 shows a schematic configuration of the image pickup device 3 of the image pickup apparatus according to the embodiment of the present invention. FIG. 2 (a) is a perspective view, and FIG. 2 (b) is a sectional view. Here, the image sensor 3 has a sensor portion 302 disposed in a central concave portion of a base portion 301 and an infrared cut glass 303 so as to cover the concave portion.
Are mounted, and a cover glass 304 is further mounted on the outer surface thereof.

FIG. 3 is a schematic diagram showing an example of the configuration of the optical system 1 of the imaging apparatus according to the present embodiment. This figure 3
In, reference numeral 305 denotes holding means for holding the infrared cut glass 303 and the cover glass 304. The focus lens 1 </ b> F is configured to move back and forth by a drive motor 16 </ b> M of the focus drive circuit 16. That is, the auto focus is executed by moving the focus lens 1F.

That is, in this embodiment, the optical low-pass filter which has conventionally existed is not provided on the light receiving surface side of the image sensor 3. For this reason, the signal level does not decrease near the Nyquist frequency of the image pickup video signal from the image pickup device 3.

FIG. 4 is an explanatory diagram showing a state of determining a focal point by a hill-climbing servo system. The horizontal axis represents the moving position of the focus lens 1F in the optical system 1, and the vertical axis represents the signal level of the high-frequency component included in the captured video signal.

Here, a relatively low frequency component is converted to a BPF
The high-frequency component A of the loose peak obtained by extracting at 1, the high-frequency component B of the sharp mountain obtained by extracting the frequency component higher than BPF1 by BPF2, and the high-frequency component higher than BPF2 (near the Nyquist frequency) are extracted by BPF3 The high frequency component C of an even sharper mountain is shown.

In this case, when executing auto focus, first, the focus lens 1F in the optical system is moved to either side, and a signal obtained by filtering the imaged video signal with the BPF1 is referred to as shown in FIG. Find a rough mountain peak. Next, the filter is switched to BPF2, the focus lens 1F in the optical system is moved to either side, and a sharp peak is found as shown in FIG. Thereby, highly accurate auto focus can be performed. Then, the filter is switched to BPF3, the focus lens 1F in the optical system is moved to either side, and a sharper peak of the mountain is found as shown in FIG.
Thereby, extremely accurate autofocus can be performed.

In FIG. 4, C is the signal level of the high frequency component near the Nyquist frequency, the broken line indicates the case where the conventional optical low-pass filter is used, and the solid line indicates the case where the optical low-pass filter is not used. Is shown. As described above, by not using the optical low-pass filter, the high-frequency component near the Nyquist frequency is not attenuated, and the peak becomes sharp.

For this reason, as shown in FIG. 4, conventionally, autofocus was performed with a high-frequency component A having a relatively wide band or a high-frequency component B having a frequency higher than A. However, in this embodiment, Since autofocus using a high-frequency component near the limit near the Nyquist frequency such as C can be performed, it is easy to find the peak position of focus (FIG. 4F1), and it is possible to improve the focus accuracy. In FIG. 4, the autofocus is executed in three stages of A → B → C, but may be executed in two stages of A → C.

In this embodiment, since an optical low-pass filter is not used, moire may occur when focusing is performed completely. Therefore, FIG.
The main microcomputer 8 controls the focus drive circuit 16 so as to adjust the focus to a focus position shifted by a predetermined amount from the in-focus position detected as shown in FIG.

As a result, the focus can be adjusted with high precision without lowering the level of the high-frequency component of the picked-up video signal, and moire occurs because the focus adjustment of the image pickup lens is shifted by a predetermined amount as necessary. Not even.

Shifting by a predetermined amount means shifting the focus up to a signal level near the Nyquist frequency obtained when a conventional optical low-pass filter is used. That is, F1 is changed to F
2 or F3.

If the occurrence of moire does not pose a problem, the adjustment may be made with F1 as the focus position. In addition,
When the main microcomputer 8 detects that the in-focus position is near or at infinity, it is desirable to adjust the focus of the imaging lens to a focal position shifted by a predetermined amount from infinity to a short distance side. In this case, if the focus position is near infinity, the focus adjustment is shifted to the short distance side.
The in-focus range becomes wider than shifting to the far side from infinity.

When the occurrence of moire does not pose a problem, the above-mentioned in-focus position does not have to be shifted. Therefore,
A moiré prevention mode in which the same resolution as before can be obtained by preventing moiré by selecting a mode by the user's will, and a high-quality mode in which some moire may occur but a higher resolution than before can be obtained. May be switched.

When a plurality of peaks appear in the characteristic diagram as shown in FIG. 4, it means that there are a plurality of subjects at different distances. In that case, moiré avoidance may be performed by shifting the focus position so as not to overlap the distance between a plurality of mountains. In this case, by setting a middle position between the plurality of mountains as the focus position, it is possible to shoot a plurality of subjects at different distances with high sharpness.

The image sensor 3 of this embodiment has a structure without an optical low-pass filter. However, since the infrared cut glass 303 and the cover glass 304 are provided, the sensor section 302 is provided. The dust-proof property is secured. In addition, by providing the infrared cut glass 303 or the cover glass 304 with a property of blocking ultraviolet rays or electromagnetic waves having a shorter wavelength, it is possible to prevent pixel damage of the sensor unit 302 due to harmful ultraviolet rays or various cosmic rays.

In FIG. 2, both the infrared cut glass 303 and the cover glass 304 are used. However, for the above-described dustproofness and prevention of pixel destruction, one of the infrared cut glass 303 and the cover glass 304 is used. May be provided.

[0068]

As described in detail above, according to each invention described in this specification, the following effects can be obtained.

(1) In the imaging apparatus according to the first aspect, focus detection is performed by using a high-frequency component of an image signal obtained by photoelectrically converting an image that does not pass through an optical low-pass filter. Since the levels of the components do not decrease, it is possible to perform focusing with high accuracy.

(2) In the imaging apparatus according to the second aspect, focus detection is performed by using a high-frequency component of an image signal obtained by photoelectrically converting an image that does not pass through an optical low-pass filter. High-accuracy focus adjustment can be performed without lowering the component level, and moire does not occur because the focus adjustment of the imaging lens is shifted by a predetermined amount. Note that the predetermined amount for shifting the focus adjustment is based on the extent to which moiré does not occur or the extent to which the resolving power obtained when using a conventional optical low-pass filter is obtained.

(3) In the imaging apparatus according to the third aspect, focus detection is performed by using a high-frequency component of an image signal obtained by photoelectrically converting an image that does not pass through an optical low-pass filter. High-accuracy focus adjustment can be performed without lowering the component level, and moire does not occur because the focus adjustment of the imaging lens is shifted by a predetermined amount. When the focus position is near infinity, the focus adjustment is shifted to the short distance side, so that the focus range is wider than when the focus adjustment is shifted to the far distance side from infinity.

(4) In the imaging apparatus according to the fourth aspect, focus detection is performed by using a high-frequency component of an image signal obtained by photoelectrically converting an image that does not pass through an optical low-pass filter. High-accuracy focus adjustment can be performed without lowering the component level, and moire does not occur because the focus adjustment of the imaging lens is shifted by a predetermined amount. When the in-focus positions of a plurality of subjects are detected, the focus is adjusted so as to be between the plurality of subjects, so that the in-focus range is widened.

(5) In the solid-state image pickup device according to the fifth aspect of the invention, the light receiving surface of the solid-state image pickup device can be protected by using the infrared cut glass as the dust-proof cover glass.

(6) In the solid-state imaging device according to the sixth aspect, the infrared cut glass and the dust-proof cover glass are integrally held, so that the light receiving of the solid-state imaging device can be performed using the same holding mechanism as in the related art. The surface can be protected.

(7) In the image pickup apparatus according to the seventh aspect, the infrared cut glass and the dust-proof cover glass are integrally held or the infrared cut glass is used as the dust-proof cover glass. It is possible to protect the light receiving surface of the solid-state imaging device by using the same holding mechanism as described above.

[Brief description of the drawings]

FIG. 1 is a functional block diagram illustrating a configuration of an imaging device used in an embodiment of the present invention.

FIG. 2 is a configuration diagram illustrating a configuration of an image sensor used in an embodiment of the present invention.

FIG. 3 is a configuration diagram showing a configuration of an image sensor and an optical system used in an embodiment of the present invention.

FIG. 4 is an explanatory diagram illustrating a state of an autofocus of the imaging apparatus used in the embodiment of the present invention.

FIG. 5 is an explanatory diagram illustrating a state of autofocus of a conventional imaging device.

FIG. 6 is a characteristic diagram showing a relationship between characteristics of an optical low-pass filter used in a conventional imaging apparatus and an autofocus sampling frequency.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lens 2 Aperture stop 3 Image sensor 4 Pre-processing circuit 5 A / D converter 6 Signal processing circuit 7 Memory controller 8 Main microcomputer 9 Frame memory 10 Image storage memory 11 PC card controller 12 Strobe 13 Serial port driver 14 Sub microcomputer 15 Aperture drive circuit 16 Focus drive circuit 17 Video amplifier 18 Liquid crystal display unit 19 CCD drive circuit

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (Reference) H04N 5/335 G03B 3/00 A F term (Reference) 2H011 AA03 BA31 BB04 CA21 2H051 BA47 CB13 CD25 CD29 CD30 CE14 DD10 FA48 2H083 AA04 AA09 AA26 AA28 AA32 AA52 AA54 5C022 AB02 AB13 AB15 AB29 AC03 AC42 AC54 AC55 AC66 AC74 5C024 AA01 AA05 CA02 CA23 EA02 EA08 GA11 HA14 HA24

Claims (7)

[Claims] An imaging lens that forms an optical system that forms an image of a subject on an imaging surface; and an imaging lens that is provided at a position on the imaging surface of the imaging lens and that performs photoelectric conversion on an image obtained by the imaging lens. A solid-state imaging device that generates a signal; a focus detection unit that performs focus detection with reference to a high-frequency component of an imaged video signal obtained by the solid-state imaging device; and the imaging lens according to a detection result of the focus detection unit. Focus adjustment means for performing focus adjustment of, and wherein the focus detection means performs focus detection using a high-frequency component of an image signal obtained by photoelectrically converting an image that does not pass through an optical low-pass filter. Imaging device. 2. The imaging apparatus according to claim 1, wherein the focus adjustment unit adjusts the focus of the imaging lens to a focus position shifted by a predetermined amount from a focus position detected by the focus detection unit. apparatus. 3. The method according to claim 1, wherein, when the focus position detected by the focus detection unit is near infinity, the focus adjustment unit shifts the focus of the imaging lens to a focal position shifted by a predetermined amount from infinity to a short distance side. The imaging device according to claim 1, wherein adjustment is performed. 4. The method according to claim 1, wherein the focus adjustment unit detects a focus position of a plurality of subjects by the focus detection unit.
3. The imaging apparatus according to claim 1, wherein the focus of the imaging lens is adjusted so as to be between the plurality of subjects.
The imaging device according to any one of the above. 5. An imaging lens provided at a position of an imaging plane of the imaging lens,
A solid-state imaging device that generates an image signal by photoelectrically converting an image obtained by the imaging lens, wherein an infrared cut filter is provided on a light receiving surface of the solid-state imaging device,
The solid-state imaging device, wherein the infrared cut filter is used as a dust-proof cover glass of the solid-state imaging device. 6. An imaging lens provided at a position on an imaging surface of an imaging lens,
A solid-state imaging device that photoelectrically converts an image obtained by the imaging lens to generate an image signal, wherein an infrared cut filter and a dust-proof cover glass are provided on a light receiving surface of the solid-state image sensor, and the infrared cut filter is provided. And a holding means for holding the dust proof cover crow and the dust cover integrally. 7. An imaging apparatus using the solid-state imaging device according to claim 5 as an image receiving unit.