JP5019385B2 - Autofocus image sensor - Google Patents

Description

  The present invention relates to an autofocus imaging device which is a solid-state imaging device such as an autofocus line sensor or a two-dimensional image sensor used in an optical apparatus such as a digital camera or a video camera.

2. Description of the Related Art Conventionally, in an image sensor having a plurality of pixel rows for autofocus (AF) of a single-lens reflex camera, a plurality of line sensors and monitor sensors as disclosed in Patent Document 1 can be arbitrarily combined with external signals. There is known a system that can be driven and controlled by a different type of focus detection optical system.
JP 2004-272238 A

  The method disclosed in Patent Document 1 is configured such that a plurality of line sensors and monitor sensors can be operated in any combination, but sensitivity, gain, accumulation end level setting, etc. can be combined with a plurality of line sensors. There is no description of functions that can be set for each.

  If a register for setting items is provided for each optical system that can be used for mounting the functions as described above, there are problems such as an increase in circuit scale, and an increase in cost and restrictions on mounting space.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an autofocus imaging device that can cope with the use of a plurality of AF optical systems while suppressing an increase in circuit scale and a decrease in function.

One aspect of the autofocus imaging device of the present invention is composed of a plurality of pixels arranged in two regions of a reference portion and a reference portion for receiving a light beam obtained by dividing a light beam from a target to be autofocused into pupils. When a first autofocus optical system having a plurality of islands and a reference-portion imaging lens for guiding a light beam to the plurality of islands and a reference-portion imaging lens is applied, a predetermined correspondence relationship is established. In an autofocus imaging device in which control parameters can be set for each island pair consisting of one standard part island and one reference part island,
A plurality of registers for setting control parameters for each island;
When applying the second autofocus optical system in which the distance between the optical axes of the reference portion imaging lens and the reference portion imaging lens is narrower and the effective light beam range is narrower than that of the first autofocus optical system. A first island pair in which pixel data of any one of the standard part island and the reference part island among the island pairs is invalid;
When applying the second autofocus optical system, among the island pairs, a second island pair that is effective for pixel data of both the standard part island and the reference part island;
A controller that controls the plurality of registers and the connection between the plurality of islands and the registers in accordance with the application of the first and second autofocus optical systems;
Have
The control unit
When the first autofocus optical system is applied, the same register is connected to the reference island and the reference island of the first island pair, and the reference island of the second island pair and Connect a separate register to the reference island,
When the second autofocus optical system is applied, connection of the register to one or both of the reference part island and the reference part island of the first island pair is prohibited.
It is characterized by that.

  According to the present invention, it is possible to provide an autofocus imaging device that can cope with the use of a plurality of AF optical systems while suppressing an increase in circuit scale and a decrease in function.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a lens interchangeable single-lens reflex camera as a camera equipped with an autofocus imaging device according to an embodiment of the present invention.

  As shown in the figure, this camera includes a camera body 101 and an interchangeable lens 102 that can be attached to and detached from the camera body 101.

  The camera body 101 includes the following optical systems and blocks. That is, the CPU 103 that constitutes a system controller (syscon) that controls the camera operation, the AF sensor 104 that is the autofocus imaging device according to the present embodiment, the AF arithmetic IC 105 that controls the AF sensor 104, the prism 106, and the eyepiece A finder optical system composed of a lens 107 and the like, an AF optical system composed of a condenser lens 108, a separator lens 109, and the like, an image sensor 110 that receives and captures a subject light beam, and guides the subject light beam to the finder optical system The camera body 101 includes a main mirror 111, a sub mirror 112 for guiding the subject light flux to the AF optical system, and the like.

  The prism 106 of the finder optical system performs inversion of the subject image in order to display an erect image of the subject as the finder image, and the eyepiece 107 forms the subject image as the finder image. The finder optical system further includes a finder screen 113 on which the subject light flux that has passed through the photographing optical system is projected by the main mirror 111.

  The main mirror 111 is down as shown in the figure at the time of AF, divides the subject luminous flux that has passed through the photographing optical system into an AF optical system and a finder optical system, and is raised upward at the time of photographing to capture the entire luminous flux. Lead to element 110. The image sensor 110 receives the subject light flux that has passed through the photographing optical system, and performs imaging.

  The sub mirror 112 reflects the subject light beam that has passed through the photographing optical system and passed through the half mirror portion of the main mirror 111, and guides it to the AF optical system. Note that reference numeral 114 in the figure is an imaging equivalent that is a virtual surface on the front surface of the condenser lens 108 where the subject image is in focus when the subject light flux that has passed through the photographing optical system is in focus on the image sensor 110. Shows the surface.

  The AF optical system includes a condenser lens 108 that collects a subject light beam that is transmitted through the photographing optical system and reflected by the sub mirror 112, and a mirror that reflects the subject light beam incident on the AF optical system by the sub mirror 112 and guides it to the AF sensor 104. 115, a separator diaphragm 116 for dividing the subject luminous flux collected by the condenser lens 108 into pupils, and a separator lens 109 for re-imaging the subject luminous flux divided by the separator diaphragm 116 as a subject image on the AF sensor 104. It consists of.

  The AF calculation IC 105 is formed by a hardware integrated circuit that performs control of the AF sensor 104 that is an image sensor for autofocus according to the present embodiment and performs a part of AF calculation using the output data. The operation control of the AF arithmetic IC 105 is performed by the CPU 103 as a system controller that performs various camera operations and arithmetic control.

  On the other hand, an interchangeable lens 102 that forms a subject image on the image sensor 110 and is detachable from the camera body 101 is used for focus adjustment that is driven in the optical axis direction of the interchangeable lens 102 to obtain a focused state. Focus lens 117, a motor driver 118 for driving the focus lens 117, a defocus amount received from the camera body 101, a drive amount of the focus lens 117 is calculated, and the focus lens 117 is driven by the drive amount. And a lens CPU 119 to be controlled.

  Next, the operation of the AF sensor 104, which is an autofocus imaging device according to an embodiment of the present invention, in the camera will be described.

  FIG. 2 is a diagram illustrating an AF optical system in which the AF sensor 104 is incorporated and pixels of the AF sensor 104. In FIG. 2, 120a indicates a horizontal pixel column of the AF sensor 104, and 120b indicates a vertical pixel column of the AF sensor 104. . Other optical elements are the same as those described in FIG.

  FIGS. 3A and 4A are front views of the AF sensor 104. A pixel row divided into 2 to 5 blocks (hereinafter referred to as islands) is shown in the horizontal direction of the AF sensor 104. FIG. Are arranged in 3 rows and 5 rows in the vertical direction. In FIGS. 3A and 4A, islands not hatched indicate valid islands, and hatched islands indicate invalid islands. The horizontal pixel column 120a is composed of a horizontal direction reference portion pixel row 120a1 and a horizontal direction reference portion pixel row 120a2, and the vertical pixel row 120b is formed of a vertical direction reference portion pixel row 120b1 and a vertical direction reference portion pixel row 120b2. Become.

  For example, the first AF has a base length between the center of the island h3cb and the center of h3cr in the horizontal direction in FIG. 3A and a base length between the center of the island v3cb and the center of v3cr in the vertical direction. In the case of applying the optical system, by setting the validity / invalidity of each island as shown in FIG. 3A, all 11 points in the shooting screen 121 as shown in FIG. At the distance measuring point 122, a known phase difference AF is possible in two horizontal and vertical directions.

  4A, for example, the base line length is between the center of the island h3db and the center of h3br in the horizontal direction, and the base line length is between the center of the island v4cb and the center of v2cr in the vertical direction. When the second AF optical system whose length is smaller than that of the first AF optical system is applied, the valid / invalid setting of each island as shown in FIG. The known phase difference AF can be performed in two partially horizontal and vertical directions at seven distance measuring points 122 in the photographing screen 121 as shown in FIG.

  The baseline length is optically approximately equal to the optical axis interval of the separator lens 109 (separator diaphragm 116). In this way, the invalid island is crushed and the effective luminous flux does not reach, so that proper distance measurement cannot be performed.

  In addition, the islands x1b to x3b and x1r to x3r shown with hatching in FIG. 3A are islands for the 7-point mode that are not used in the 11-point mode. It functions as an effective island as shown in (A).

  Although switching of island setting in the 11-point / 7-point mode will be described later, the control circuit in the AF sensor 104 which is the image sensor for autofocus according to the present embodiment is passed through the AF arithmetic IC 105 based on a command from the CPU 103. The register is set, and the island is set.

  FIG. 5 shows the configuration and output of the h2 column (upper column in the three columns of FIG. 3A) of the horizontal direction reference portion pixel column 120a2 of the AF sensor 104 for the sake of simplicity of explanation and illustration. It is a figure which shows a circuit part.

  The pixel portion includes a plurality of light-shielding pixels 123, invalid pixels 124, and effective pixels 125, and the effective pixel portion is divided into three islands by the invalid pixels 124.

  The pixel units in the upper and lower two columns constituting the h2 column are arranged with a shift of ½ of the pixel pitch, and the charges output from the pixel unit pass through the charge transfer paths 126 arranged above and below, Further, the signal is input to the pixel charge voltage conversion unit 128 via the reader unit 127. The pixel charge-voltage conversion unit 128 is configured by an FDA or the like that converts charge into voltage, and converts the charge transferred from the charge transfer path 126 up and down alternately into voltage.

  The converted voltage signal is input to the output pixel column selection unit 130 via a gain control amplifier 129 such as a CDS amplifier.

  The voltage signal input to the output pixel column selection unit 130 is output to the outside of the AF sensor 104 via the buffer amplifier 132 in accordance with the switch control of the pixel output changeover switch 131a in the output pixel column selection unit 130. . Note that the pixel output changeover switch 131 a of the output pixel column selection unit 130 is controlled by the AF arithmetic IC 105.

  Further, between the upper and lower two pixel units, the same number of monitor pixels 133 as the number of islands used in the accumulation control are arranged, and the reset signal φRM line of the monitor pixel 133 and the output signals vmon1 to 3 are connected.

  The charge generated in the monitor pixel 133 is converted into a voltage signal by the monitor charge / voltage converter 134 and output to a storage control circuit (not shown).

  The pixel rows other than the h2 column of the horizontal direction reference portion pixel row 120a2 of the AF sensor 104 and other horizontal and vertical pixel rows have the same configuration as described above, and the AF sensor 104 has four pixel data output terminals. Have.

  FIG. 6 is a diagram showing a configuration near the pixel portion of the AF sensor 104. In the figure, reference numeral 135 is a photodiode (PD unit), 136 is a first transfer gate, 137 is a storage (ST unit), 138 is a second transfer gate, and 139 is a charge transfer path (CCD unit). Show. TG1 is an ON / OFF control signal for the first transfer gate 136, TG2 is an ON / OFF control signal for the second transfer gate 138, φRS is a reset signal for resetting unnecessary charges in the ST unit 137, φ1, φ2 indicates an opposite phase charge transfer clock signal supplied during charge transfer in the CCD unit 139.

  The PD unit 135 photoelectrically converts the imaged subject light beam and outputs a charge corresponding to the amount of incident light. The first transfer gate 136 transfers charges from the PD unit 135 to the ST unit 137 in accordance with the TG1 signal. The ST unit 137 temporarily holds the charge transferred from the PD unit 135. The second transfer gate 138 transfers charges from the ST unit 137 to the CCD unit 139 by the TG2 signal. The CCD unit 139 transfers charges according to the transfer frequency of the φ1 and φ2 signals.

  FIG. 7 is a diagram illustrating a simple timing chart from the accumulation control sequence in the AF sensor 104 to the start of the reading sequence.

  First, by inputting a TG1 pulse (L → H → L) to the first transfer gate 136, the unnecessary charge of the PD unit 135 is reset, and by setting the φRS signal to the H state, the unnecessary charge of the ST unit 137 is reset. Then, the accumulation operation is started by the H → L of the φRS signal.

  Next, when the vmon signal output from the monitor pixel 133 reaches a predetermined level VTH, the TG1 pulse is input again to the first transfer gate 136, and the charge accumulated in the PD unit 135 is transferred to the ST unit 137. The accumulation operation ends.

  Then, by inputting a TG2 pulse (L → H → L) after the TG1 pulse, charges are transferred from the ST unit 137 to the CCD unit 139.

  FIG. 8 is a diagram showing a configuration of a monitor pixel control circuit in the AF sensor 104 which is an autofocus image sensor according to the present embodiment.

  The monitor pixel (MPD) 133 is a PD for monitoring the accumulation level of the AF sensor light receiving unit. The monitor charge / voltage converter 134 includes an inverter circuit 140 for inverting the reset signal φRM of the monitor pixel 133, a switch circuit 141 for resetting the accumulation level of the monitor pixel 133 controlled by the reset signal φRM, The integrating capacitor 142 for accumulating charges generated in the monitor pixel 133 is formed. The monitor signal vmon, which is an output signal of the monitor charge voltage conversion unit 134, is input to the accumulation control circuit 143 that performs accumulation control of the AF sensor light receiving unit in accordance with the accumulation level of the monitor pixel 133.

  FIG. 9 is a diagram illustrating a simple timing chart of monitor control in the accumulation control sequence.

  By changing the monitor reset signal φRM from H → L, the reset of the monitor pixel 133 is released, and accumulation by the monitor capacitor 133 in the integration capacitor 142 is started. When accumulation is started, the monitor signal vmon accumulates in a direction in which the voltage drops from the reference voltage VREF.

  The accumulation control circuit 143 monitors such a monitor signal vmon. When the monitor signal vmon reaches the accumulation end voltage VTH, the TG1 pulse is input to the first transfer gate 136, and the accumulation operation in the PD unit 135 is performed. finish.

  FIG. 10 is a timing chart of the pixel data reading sequence of the horizontal direction reference portion pixel row 120a2 of the AF sensor 104.

  First, the charge transfer of the h3 column of the horizontal direction reference portion pixel column 120a2 is started by the pulse of the second transfer gate control signal TG2_h3 of the h3 column. At the same time, when the pixel output selector switch 131b (see FIG. 5) is turned on by the pixel output selector switch control signal sw_cont_h3 in the h3 column, as shown in FIG. Each data is output in the order of the reader unit 127 of the h3 column, the light shielding pixel 123, the invalid pixel 124, and the effective pixel 125.

  Next, during the charge transfer of the effective pixels 125 in the h3 column, the pulse of the second transfer gate control signal TG2_h2 in the h2 column is input to the h2 column. However, at this time, the pixel output change-over switch 131a in the h2 column is in an OFF state, and the data of the effective pixels 125 in the h3 column are output to the outside of the AF sensor 104.

  Then, at the timing when the output of the data of the effective pixels 125 in the h3 column ends, the pixel output changeover switch 131b is turned off by the pixel output changeover switch control signal sw_cont_h3 in the h3 column, and the pixel output changeover switch control signal sw_cont_h2 in the h2 column Thus, the pixel output changeover switch 131a is turned on, and the data of the effective pixel 125 in the h2 column is output to the outside of the AF sensor 104 following the data of the effective pixel 125 in the h3 column.

  That is, as described above, the second transfer gate control signal TG2_h2 in the h2 column is at a timing such that the output end of the h3 column effective pixel data to the outside of the AF sensor 104 and the output start of the h2 column effective pixel data continue. Are input to the h2 column.

  Regarding the charge transfer start of the h2 and h4 columns and the ON / OFF timing of the pixel output change-over switches 131a and 131c (see FIG. 5), the same control as described above is performed, so that the h3 The data of the effective pixels 125 in the h4 column from the column can be continuously output.

  Next, with reference to FIGS. 11 to 14B, island setting and the like in the 11-point mode and the 7-point mode of the AF sensor 104 that is the image sensor for autofocus according to the present embodiment will be described.

  FIG. 11 shows the correspondence between the 11-point mode and the 7-point mode of islands that are paired during correlation calculation when obtaining the two-image interval value in phase difference AF calculation based on output data from the AF sensor 104. It is a figure which shows a table | surface.

  FIG. 12 shows the relationship between each island control register configured in the AF arithmetic IC 105 and the corresponding island to be controlled, and the relationship between the register setting values in each of the 11-point mode and the 7-point mode. It is a figure which shows the corresponding table to represent.

  Note that the bidirectional arrows shown on the right side of the correspondence table in FIG. 12 indicate combinations of islands that are paired in the correlation calculation in the seven-point mode.

  Further, the register set values a to v in the correspondence table of FIG. 12 are variables indicating control codes having a predetermined number of bits set in the registers. In the correspondence table of FIG. 12, the combination of islands for each distance measuring point in each of the 11-point and 7-point modes is shown as another variable so that the islands for which the same variable is set are 11 points and The combination of islands constituting each distance measuring point in the 7-point mode is shown.

This will be described in more detail below.
The islands that reflect the register settings of the registers Reg_h2b to Reg_v4d in FIG. 12 are determined so that the correspondence relationship between the islands of the reference unit and the reference unit in the correlation calculation is as shown in FIG.

  For example, in the 11-point mode, the control code a set in the register Reg_h2b is reflected in the h2bb island and the h2br island, and control is performed with these two islands having the same monitor characteristics, sensitivity, gain, and the like.

  In the known correlation calculation based on the pixel data of the standard part and the reference part, the similarity of the image data is important in order to obtain the correlation between the image data of the standard part and the reference part. Therefore, it is desirable that the pixel data of the standard part and the reference part have the same characteristics. For this purpose, the sensitivity and gain of the gain control amplifier 129, the buffer amplifier 132, etc., which are characteristic factors of the standard part and the reference part, and the storage end voltage VTH, etc., which are monitor characteristics, are set to be the same.

  In the 7-point mode, the correspondence relationship of the islands paired in the correlation calculation is changed to h2db island and h2br island in the same h2 column. In this case, the same control code a is set in the registers Reg_h2b and Reg_h2d. Thus, the same control can be executed on the two islands.

  13A to 14B schematically show the relationship between the registers and the islands in each mode. That is, FIG. 13A is a diagram showing a correspondence relationship between the registers in the 11-point mode of the correspondence table of FIG. 12 and the connection of each horizontal island, and FIG. 13B is a diagram of the registers in the 7-point mode of the correspondence table of FIG. It is a figure which shows the correspondence of the connection of each horizontal island. 14A is a diagram showing a correspondence relationship between the registers in the 11-point mode of the correspondence table of FIG. 12 and the connection of each vertical island, and FIG. 14B is a diagram of the registers in the 7-point mode of the correspondence table of FIG. It is a figure which shows the correspondence of the connection of each vertical island.

  In FIGS. 13A to 14B, the hatched portions indicate islands, registers, and control circuits that are effective in each mode, and the hatched portions indicate islands, registers, and control that are disabled in each mode. Each circuit is shown. A solid line indicates a control line that is valid in each mode, and a broken line indicates a control line that is invalid in each mode.

  Register Reg_h2b~Reg_h2d, Reg_h3a~Reg_h3e, Reg_h4b~Reg_h4d, Reg_v2b~Reg_v2d, Reg_v3a~Reg_v3e, Reg_v4b~Reg_v4d and control circuit Reg_cnt_h2b~Reg_cnt_h2d, Reg_cnt_h3a~Reg_cnt_h3e, Reg_cnt_h4b~Reg_cnt_h4d, Reg_cnt_v2b~Reg_cnt_v2d, Reg_cnt_v3a~Reg_cnt_v3e, Reg_cnt_v4b~Reg_cnt_v4d Is configured in the AF sensor 104, and a control circuit Reg_cnt_ * (* is the name of each control circuit) is set by a control signal from the AF arithmetic IC 105.

  Therefore, FIG. 13A to FIG. 14B show the connection relationship when the control code for setting the islands paired by the register control circuit Reg_cnt_ * to the same control condition is set in each register Reg_ * (* is the name of each register). Show.

  For example, in the 11-point mode, since the h3cb island and the h3cr island have a paired relationship, the same control code is written to the registers Reg_h3cb and Reg_h3cr from the control circuit Reg_cnt_h3cb.

  As described above, depending on whether the type of the AF optical system to be applied is for 11 points or 7 points, the CPU 103 inputs a control signal to the AF sensor 104 via the AF arithmetic IC 105, and It is possible to set the control circuit Reg_cnt_ * and set the island to the 11-point mode or the 7-point mode by using the control circuit Reg_cnt_ *.

  As described above, according to the present embodiment, it is possible to change the AF optical system by changing the register setting value without preparing a different register for each of a plurality of AF optical systems corresponding to the same AF sensor 104. Thus, it is possible to cope with the use of a plurality of AF optical systems while suppressing an increase in circuit scale.

[Modification]
As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited to one Embodiment mentioned above, Of course, a various deformation | transformation and application are possible within the range of the summary of this invention. It is.

  For example, in the above embodiment, the control circuit Reg_cnt_ * in the AF sensor 104 is set by the control signal from the AF arithmetic IC 105, and the setting of the register Reg_ * is controlled by the control circuit Reg_cnt_ *. As a modification, the configuration may be such that settings can be made directly from the outside of the AF sensor 104 so that the correspondence relationship in each mode is as shown in the correspondence table of FIG. At that time, the register Reg_ * is directly set by the control signal of the AF arithmetic IC 105.

  In this case, it is necessary to perform processing such as changing the register combination performed in the control circuit Reg_cnt_ *. However, the circuit scale for the control circuit can be reduced, and the cost can be reduced.

  Further, the present invention is not limited to the 11-point mode and the 7-point mode, and more multi-point modes may be set.

FIG. 1 is a block diagram of a camera equipped with an autofocus imaging device according to an embodiment of the present invention. FIG. 2 is a schematic diagram of the AF optical system of the camera of FIG. FIG. 3A is a front view of the AF sensor for explaining an effective island in the 11-point mode of the AF sensor that is an image sensor for autofocus according to one embodiment, and FIG. It is a figure which shows the AF point example in the imaging | photography screen at the time of point mode. FIG. 4A is a front view of an AF sensor for explaining an effective island in the 7-point mode, and FIG. 4B is a diagram showing an example of an AF point in the shooting screen in the 7-point mode. is there. FIG. 5 is a diagram showing the configuration of the pixel column of the AF sensor and the output circuit unit. FIG. 6 is a diagram illustrating a configuration around the pixel portion of the AF sensor. FIG. 7 is a timing chart of the reset / accumulation control sequence of the effective pixel portion of the AF sensor. FIG. 8 is a diagram showing the configuration of the monitor pixel control circuit of the AF sensor. FIG. 9 is a timing chart of the reset / accumulation control sequence of the monitor pixel portion of the AF sensor. FIG. 10 is a timing chart of the pixel data reading sequence of the AF sensor. FIG. 11 is a diagram showing a correspondence table showing combinations of 11-point mode and 7-point mode of islands that are paired at the time of correlation calculation when obtaining a two-image interval value in phase difference AF calculation. FIG. 12 is a diagram showing a correspondence table showing a correspondence relationship between each island control register and controlled islands used in the 11-point mode and the 7-point mode. FIG. 13A is a diagram showing a correspondence relationship between the registers and the horizontal islands in the 11-point mode of the correspondence table of FIG. FIG. 13B is a diagram illustrating a correspondence relationship between the registers and the horizontal islands in the seven-point mode of the correspondence table of FIG. FIG. 14A is a diagram showing a correspondence relationship between the registers and the vertical islands in the 11-point mode of the correspondence table of FIG. FIG. 14B is a diagram showing a correspondence relationship between the registers and the vertical islands in the seven-point mode of the correspondence table of FIG.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 101 ... Camera body, 102 ... Interchangeable lens, 103 ... CPU, 104 ... AF sensor, 106 ... Prism, 105 ... AF arithmetic IC, 107 ... Eyepiece lens, 108 ... Condenser lens, 109 ... Separator lens, 110 ... Imaging element, 111 DESCRIPTION OF SYMBOLS ... Main mirror, 112 ... Sub mirror, 113 ... Viewfinder screen, 114 ... Imaging equivalent surface, 115 ... Mirror, 116 ... Separator diaphragm, 117 ... Focus lens, 118 ... Motor driver, 119 ... Lens CPU, 120a ... Horizontal pixel row, 120a1 ... horizontal direction reference part pixel row, 120a2 ... horizontal direction reference part pixel row, 120b ... vertical pixel row, 120b1 ... vertical direction reference part pixel row, 120b2 ... vertical direction reference part pixel row, 121 ... shooting screen, 122 ... distance measurement Dot, 123 Light-shielding pixel, 124 ... Invalid pixel, 125 ... Effective pixel, 126 ... Charge transfer path, 127 ... Reader unit, 128 ... Pixel charge / voltage conversion unit, 129 ... Gain control amplifier, 130 ... Output pixel column selection unit, 131a to 131c DESCRIPTION OF SYMBOLS ... Pixel output changeover switch, 132 ... Buffer amplifier, 133 ... Monitor pixel, 134 ... Monitor charge voltage conversion part, 135 ... Photodiode (PD part), 136 ... First transfer gate, 137 ... Storage (ST part), 138: Second transfer gate, 139: Charge transfer path (CCD unit), 140: Inverter circuit, 141: Switch circuit, 142: Integration capacitor, 143: Accumulation control circuit, Reg_h2b to Reg_h2d, Reg_h3a to Reg_h3e, Reg_h4b to Reg_h4d , Reg_v2b Reg_v2d, Reg_v3a~Reg_v3e, Reg_v4b~Reg_v4d ... register, Reg_cnt_h2b~Reg_cnt_h2d, Reg_cnt_h3a~Reg_cnt_h3e, Reg_cnt_h4b~Reg_cnt_h4d, Reg_cnt_v2b~Reg_cnt_v2d, Reg_cnt_v3a~Reg_cnt_v3e, Reg_cnt_v4b~Reg_cnt_v4d ... control circuit.

Claims (2)

It has a plurality of islands composed of a plurality of pixels arranged in two regions of a reference part and a reference part for receiving a light beam obtained by dividing a light beam from an object to be autofocused into pupils. When applying the first autofocus optical system having the reference portion imaging lens for guiding the light beam and the reference portion imaging lens, from one reference portion island and one reference portion island having a predetermined correspondence relationship. In the image sensor for autofocus in which the control parameter can be set for each island pair,
A plurality of registers for setting control parameters for each island;
When applying the second autofocus optical system in which the distance between the optical axes of the reference portion imaging lens and the reference portion imaging lens is narrower and the effective light beam range is narrower than that of the first autofocus optical system. A first island pair in which pixel data of any one of the standard part island and the reference part island among the island pairs is invalid;
When applying the second autofocus optical system, among the island pairs, a second island pair that is effective for pixel data of both the standard part island and the reference part island;
A controller that controls the plurality of registers and the connection between the plurality of islands and the registers in accordance with the application of the first and second autofocus optical systems;
Have
The control unit
When the first autofocus optical system is applied, the same register is connected to the reference island and the reference island of the first island pair, and the reference island of the second island pair and Connect a separate register to the reference island,
When the second autofocus optical system is applied, connection of the register to one or both of the reference part island and the reference part island of the first island pair is prohibited.
Autofocus imaging device, characterized in that. When the first autofocus optical system is applied, the pixel data is invalid in an island that does not constitute an island pair, and when the second autofocus optical system is applied, the pixel data is Has a third island to become active,
The control unit
When the first autofocus optical system is applied, the connection of the register to the third island is prohibited,
2. The register according to claim 1, wherein when the second autofocus optical system is applied, a resistor connected to one of the second island pairs is connected to the third island. Autofocus image sensor.

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