WO2023074190A1 - 半導体装置および測距装置 - Google Patents
半導体装置および測距装置 Download PDFInfo
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- WO2023074190A1 WO2023074190A1 PCT/JP2022/034904 JP2022034904W WO2023074190A1 WO 2023074190 A1 WO2023074190 A1 WO 2023074190A1 JP 2022034904 W JP2022034904 W JP 2022034904W WO 2023074190 A1 WO2023074190 A1 WO 2023074190A1
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/065—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L27/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C3/00—Measuring distances in line of sight; Optical rangefinders
- G01C3/02—Details
- G01C3/06—Use of electric means to obtain final indication
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
- G01S17/10—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
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- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/60—Attaching or detaching leads or other conductive members, to be used for carrying current to or from the device in operation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/07—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L29/00
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- H01L25/18—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different subgroups of the same main group of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
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- H01S5/042—Electrical excitation ; Circuits therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/18—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
- H01S5/183—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
Definitions
- the present disclosure relates to a semiconductor device and a rangefinder.
- VCSELs Vertical Cavity Surface Emitting Lasers
- a plurality of light-emitting elements are provided in a two-dimensional array on the front or rear surface of a substrate.
- a light-emitting device for example, is configured by combining an LD (Laser Diode) chip that includes a light-emitting element and an LDD (Laser Diode Driver) substrate that drives the light-emitting element.
- LD Laser Diode
- LDD Laser Diode Driver
- parasitic inductance occurs between the LD chip and the LDD substrate, and the parasitic inductance may adversely affect the operation of the light emitting device.
- Such problems may also occur when manufacturing a semiconductor device other than a light-emitting device by combining a plurality of substrates.
- the present disclosure provides a semiconductor device and a distance measuring device capable of reducing parasitic inductance between multiple substrates.
- a semiconductor device includes a first substrate including a semiconductor element, a first electrode provided on the semiconductor element, and a second electrode extending in a first direction in plan view; a second substrate including a wiring extending in a second direction parallel to the first direction, a transistor electrically connected to the wiring, and a capacitor electrically connected to the wiring; and the first electrode.
- a first connection portion electrically connecting the second substrate and a second connection portion electrically connecting the second electrode and the second substrate are provided.
- the semiconductor element may be a light emitting element. This makes it possible, for example, to reduce the parasitic inductance of the light emitting device.
- the second electrode may have a shape surrounding the first electrode in plan view.
- the second electrode may have a rectangular shape in plan view.
- the long sides of the rectangle parallel to the first direction it is possible to make the current in the second electrode parallel to the first direction.
- the transistor and the capacitor may be connected in series by the wiring. This makes it possible, for example, to connect a transistor and a capacitor in series with a semiconductor device.
- the transistor may function as a switch that drives the semiconductor element. This makes it possible, for example, to control the operation of a semiconductor element with this transistor.
- the capacitor may be provided in the second direction of the wiring in plan view. This makes it possible, for example, to bring the current path in the second electrode closer to the current path in the wiring.
- the second substrate is electrically connected to a first pad electrically connected to the first connecting portion and the transistor, and electrically connected to the second connecting portion and the capacitor. and a second pad. Accordingly, for example, by arranging the first and second connection portions on the first and second pads, it is possible to electrically connect the first substrate and the second substrate.
- the first substrate may further include a first semiconductor substrate containing gallium and arsenic
- the second substrate may further include a second semiconductor substrate containing silicon.
- the current in the second electrode may flow parallel to the first direction in plan view.
- the current path in the second electrode and the current path in the wiring parallel it is possible to bring the current path in the second electrode closer to the current path in the wiring.
- the current in the second electrode may flow along a straight line connecting the first connection portion and the second connection portion in plan view.
- the current in the second electrode can be caused to flow parallel to the first direction in plan view.
- the current in the wiring may flow parallel to the second direction in plan view.
- the current path in the second electrode and the current path in the wiring parallel it is possible to bring the current path in the second electrode closer to the current path in the wiring.
- the current in the wiring may flow along the side surface of the wiring in plan view.
- the current in the wiring can be caused to flow parallel to the second direction in a plan view.
- the angle between the first direction and the second direction may be 5 degrees or less.
- the first direction and the second direction can be made parallel.
- the capacitor may be provided at a position lower than the first and second connection portions. This allows, for example, a capacitor to be manufactured by a semiconductor manufacturing process.
- the second substrate further includes a semiconductor substrate, an insulating film provided on the semiconductor substrate, and third and fourth electrodes provided in the insulating film,
- the capacitor may include the third and fourth electrodes. This allows, for example, a capacitor to be manufactured by a semiconductor manufacturing process.
- the second substrate may further include a semiconductor substrate, and the capacitor may be a mounted component provided on the semiconductor substrate. This makes it possible to easily prepare a capacitor, for example.
- the distance between the side surface of the wiring and the straight line connecting the first connection portion and the second connection portion in a plan view is equal to or less than the width of the second electrode. good. Accordingly, for example, by reducing this distance, it is possible to bring the current path in the second electrode closer to the current path in the wiring.
- the distance between the side surface of the wiring and the straight line connecting the first connection portion and the second connection portion is the same as the distance perpendicular to the first direction. It may be equal to or less than the pitch between the plurality of semiconductor elements in three directions. Accordingly, for example, by reducing this distance, it is possible to bring the current path in the second electrode closer to the current path in the wiring.
- a distance measuring device includes a light-emitting element that generates light, a light-emitting section that irradiates a subject with light from the light-emitting element, a light-receiving section that receives light reflected from the subject, a distance measuring unit that measures a distance to the subject based on the light received by the light receiving unit, the light emitting unit including a semiconductor element, a first electrode provided on the semiconductor element, and a plane view a first substrate including a second electrode extending in a first direction, a wiring extending in a second direction parallel to the first direction in plan view, a transistor electrically connected to the wiring, and the wiring a second substrate including an electrically connected capacitor; a first connecting portion electrically connecting the first electrode and the second substrate; and electrically connecting the second electrode and the second substrate. and a second connecting portion that connects to the As a result, for example, the parasitic inductance between the first substrate and the second substrate can be reduced by bringing the current
- FIG. 1 is a block diagram showing a configuration example of a distance measuring device 1 of a first embodiment
- FIG. 3 is a diagram for explaining the STL (Structured Light) method of the first embodiment
- It is a sectional view showing an example of structure of light-emitting device 1a of a 1st embodiment
- 4 is a cross-sectional view showing the structure of the light emitting device 1a shown in FIG. 3B.
- FIG. 1A and 1B are a plan view and a cross-sectional view showing the structure of a light emitting device 1a according to a first embodiment;
- 3A and 3B are a cross-sectional view and a plan view showing the structure of a light-emitting device 1a of a comparative example; 3A and 3B are a circuit diagram and a graph for explaining a problem of the light emitting device 1a of the first embodiment; FIG. 4 is a circuit diagram for explaining the details of the operation of the light emitting device 1a of the first embodiment; FIG. 2A and 2B are a plan view and a cross-sectional view for explaining the details of the structure of the light emitting device 1a of the first embodiment; FIG. 2 is a plan view for explaining the details of the structure of the light emitting device 1a of the first embodiment; FIG.
- FIG. 3A and 3B are a plan view and a cross-sectional view showing the structure of a light-emitting device 1a according to a modification of the first embodiment
- FIG. FIG. 4 is a plan view for explaining the details of the structure of a light-emitting device 1a of a modified example of the first embodiment
- It is a sectional view showing the structure of the light-emitting device 1a of the second embodiment.
- FIG. 11 is a plan view showing the structure of a light emitting device 1a according to a third embodiment;
- FIG. 1 is a block diagram showing a configuration example of the range finder 1 of the first embodiment.
- the distance measuring device 1 includes a light emitting unit 2, a driving unit 3, a power supply circuit 4, a light emitting side optical system 5, a light receiving side optical system 6, a light receiving unit 7, a signal processing unit 8, a control unit 9, and a temperature detector.
- a part 10 is provided.
- the light emitting unit 2 emits light from a plurality of light sources.
- the light emitting unit 2 of this example has a light emitting element 2a by VCSEL (Vertical Cavity Surface Emitting LASER) as each light source, and the light emitting elements 2a are arranged in a predetermined manner such as a matrix. configured.
- VCSEL Vertical Cavity Surface Emitting LASER
- the driving section 3 is configured with a power supply circuit for driving the light emitting section 2 .
- the power supply circuit 4 generates a power supply voltage for the drive unit 3 based on an input voltage from a battery (not shown) provided in the distance measuring device 1, for example.
- the driving section 3 drives the light emitting section 2 based on the power supply voltage.
- the light emitted from the light emitting unit 2 is applied to the subject S as the distance measurement target through the light emitting side optical system 5 . Reflected light from the subject S of the light irradiated in this way enters the light receiving surface of the light receiving section 7 via the light receiving side optical system 6 .
- the light receiving unit 7 is, for example, a light receiving element such as a CCD (Charge Coupled Device) sensor or a CMOS (Complementary Metal Oxide Semiconductor) sensor. It receives light, converts it to an electrical signal, and outputs it.
- a light receiving element such as a CCD (Charge Coupled Device) sensor or a CMOS (Complementary Metal Oxide Semiconductor) sensor. It receives light, converts it to an electrical signal, and outputs it.
- the light receiving unit 7 performs, for example, CDS (Correlated Double Sampling) processing, AGC (Automatic Gain Control) processing, etc. on an electrical signal obtained by photoelectrically converting the received light, and further performs A / D (Analog / Digital) conversion. process. Then, the signal as digital data is output to the signal processing section 8 in the subsequent stage.
- CDS Correlated Double Sampling
- AGC Automatic Gain Control
- the light receiving unit 7 of this example outputs the frame synchronization signal Fs to the driving unit 3 .
- the driving section 3 can cause the light emitting element 2a in the light emitting section 2 to emit light at a timing according to the frame cycle of the light receiving section 7.
- the signal processing unit 8 is configured as a signal processing processor such as a DSP (Digital Signal Processor).
- the signal processing section 8 performs various signal processing on the digital signal input from the light receiving section 7 .
- the control unit 9 includes, for example, a microcomputer having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), or an information processing device such as a DSP. It controls the drive unit 3 for controlling the operation and controls the light receiving operation of the light receiving unit 7 .
- a microcomputer having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), or an information processing device such as a DSP.
- the control unit 9 has a function as a distance measurement unit 9a.
- the distance measuring section 9a measures the distance to the subject S based on a signal input via the signal processing section 8 (that is, a signal obtained by receiving reflected light from the subject S).
- the distance measuring unit 9a of this example measures the distance of each part of the subject S in order to enable the three-dimensional shape of the subject S to be specified.
- the temperature detection unit 10 detects the temperature of the light emitting unit 2.
- the temperature detection unit 10 for example, a configuration that detects temperature using a diode can be adopted.
- the temperature information detected by the temperature detection unit 10 is supplied to the driving unit 3, which enables the driving unit 3 to drive the light emitting unit 2 based on the temperature information.
- (1.2) Ranging Method As a ranging method in the ranging device 1, for example, a ranging method based on the STL (Structured Light) method or the ToF (Time of Flight) method is adopted. be able to.
- STL Structured Light
- ToF Time of Flight
- the STL method is a method of measuring the distance based on an image of the subject S irradiated with light having a predetermined bright/dark pattern such as a dot pattern or grid pattern.
- FIG. 2 is a diagram for explaining the STL method of the first embodiment.
- the subject S is irradiated with pattern light Lp having a dot pattern as shown in A of FIG. 2, for example.
- the pattern light Lp is divided into a plurality of blocks BL, and each block BL is assigned a different dot pattern (a dot pattern is prevented from overlapping between blocks B).
- FIG. 2B is an explanatory diagram of the principle of distance measurement of the STL method.
- the wall W and the box BX placed in front of it are the subject S, and the subject S is irradiated with the pattern light Lp.
- “G” in the drawing schematically represents the angle of view of the light receiving section 7 .
- BLn in the figure means the light of a certain block BL in the pattern light Lp
- dn means the dot pattern of the block BLn projected on the received light image by the light receiving unit 7.
- the dot pattern of the block BLn appears at the position of "dn'" in the received light image. That is, the position where the pattern of the block BLn appears in the received light image differs between when the box BX exists and when the box BX does not exist. Specifically, pattern distortion occurs.
- the STL method is a method that obtains the shape and depth of the subject S by utilizing the fact that the irradiated pattern is distorted by the object shape of the subject S. Specifically, this method obtains the shape and depth of the object S from the distortion of the pattern.
- an IR (Infrared) light receiving unit based on a global shutter method is used as the light receiving unit 7, for example.
- the distance measuring unit 9a controls the driving unit 3 so that the light emitting unit 2 emits pattern light, and detects pattern distortion in the image signal obtained through the signal processing unit 8. , to calculate the distance based on how the pattern is distorted.
- the ToF method measures the distance to the object by detecting the flight time (time difference) of the light emitted from the light emitting unit 2 and reflected by the object until it reaches the light receiving unit 7. It is a method to
- the distance measuring unit 9a calculates the time difference between the light emitted from the light emitting unit 2 and the light received by the light receiving unit 7 from the light emission to the light reception based on the signal input via the signal processing unit 8, and calculates the time difference and the speed of light.
- dTOF direct ToF
- a light receiving unit capable of receiving IR is used as the light receiving unit 7 .
- FIG. 3 is a cross-sectional view showing an example of the structure of the light emitting device 1a of the first embodiment.
- the light-emitting device 1a of the present embodiment may be a part of the distance measuring device 1, or may be the distance measuring device 1 itself.
- the light emitting device 1a is an example of the semiconductor device of the present disclosure.
- FIG. 3A shows a first example of the structure of the light emitting device 1a of this embodiment.
- the light-emitting device 1a of this example includes an LD (Laser Diode) chip 11 including the above-described light-emitting portion 2, an LDD (Laser Diode Driver) substrate 12 including the above-described driving portion 3, a mounting substrate 13, and a heat dissipation substrate 14. , a correction lens holder 15 , one or more correction lenses 16 , and wiring 17 .
- the LD chip 11 is also called a VCSEL substrate.
- the LD chip 11 is an example of the first substrate of the present disclosure
- the LDD substrate 12 is an example of the second substrate of the present disclosure.
- a in FIG. 3 shows the X-axis, Y-axis, and Z-axis that are perpendicular to each other.
- the X and Y directions correspond to the lateral direction (horizontal direction), and the Z direction corresponds to the longitudinal direction (vertical direction).
- the +Z direction corresponds to the upward direction, and the -Z direction corresponds to the downward direction.
- the -Z direction may or may not exactly match the direction of gravity.
- the LD chip 11 is arranged on the mounting board 13 via the heat dissipation board 14 , and the LDD board 12 is also arranged on the mounting board 13 .
- the mounting substrate 13 is, for example, a printed circuit board.
- the mounting substrate 13 may further include the light receiving section 7 and the signal processing section 8 described above.
- the heat dissipation substrate 14 is, for example, a ceramic substrate such as an Al 2 O 3 (aluminum oxide) substrate or an AlN (aluminum nitride substrate).
- the correction lens holding part 15 is arranged on the heat dissipation substrate 14 so as to surround the LD chip 11 and holds one or more correction lenses 16 above the LD chip 11 .
- These correction lenses 16 are included in the light-emitting side optical system 5 described above.
- the light emitted from the light emitting section 2 in the LD chip 11 is corrected by these correcting lenses 16, and then irradiated onto the subject S described above.
- FIG. 3A shows two correction lenses 16 held by the correction lens holder 15 as an example.
- the wiring 17 is provided on the front surface, back surface, inside, etc. of the mounting substrate 13 and electrically connects the LD chip 11 and the LDD substrate 12 .
- the wiring 17 is, for example, a printed wiring provided on the front surface or the rear surface of the mounting board 13 or a via wiring penetrating the mounting board 13 .
- the wiring 17 of this embodiment also passes through or near the heat dissipation substrate 14 .
- FIG. 3B shows a second example of the structure of the light emitting device 1a of this embodiment.
- the light emitting device 1a of this example has the same components as the light emitting device 1a of the first example, but has bumps 18 instead of the wirings 17.
- FIG. 3B shows a second example of the structure of the light emitting device 1a of this embodiment.
- the light emitting device 1a of this example has the same components as the light emitting device 1a of the first example, but has bumps 18 instead of the wirings 17.
- FIG. 3B shows a second example of the structure of the light emitting device 1a of this embodiment.
- the light emitting device 1a of this example has the same components as the light emitting device 1a of the first example, but has bumps 18 instead of the wirings 17.
- FIG. 3B shows a second example of the structure of the light emitting device 1a of this embodiment.
- the light emitting device 1a of this example has the same components as the light emitting device 1a of the first example, but has bump
- the LDD substrate 12 is arranged on the heat dissipation substrate 14, and the LD chip 11 is arranged on the LDD substrate 12.
- the size of the mounting substrate 13 can be reduced as compared with the case of the first example.
- the LD chip 11 is placed on the LDD substrate 12 via bumps 18 and electrically connected to the LDD substrate 12 by the bumps 18 .
- the bumps 18 are made of metal such as gold (Au).
- the light emitting device 1a of this embodiment will be described below assuming that it has the structure of the second example shown in FIG. 3B. However, the following description is also applicable to the light emitting device 1a having the structure of the first example, except for the description of the structure specific to the second example.
- FIG. 4 is a cross-sectional view showing the structure of the light emitting device 1a shown in FIG. 3B.
- FIG. 4 shows a cross section of the LD chip 11 and the LDD substrate 12 in the light emitting device 1a.
- the LD chip 11 includes a substrate 21, a laminated film 22, a plurality of light emitting elements 23, a plurality of anode electrodes 24, and a cathode electrode 25.
- the LDD substrate 12 is a substrate 31 and a plurality of connection pads 32 .
- a light-emitting element 23 shown in FIG. 4 is a specific example of the above-described light-emitting element 2a.
- illustration of a plug 33, a wiring 34, an interlayer insulating film 35, etc., which will be described later, is omitted (see FIG. 5).
- the substrate 21 is, for example, a compound semiconductor substrate such as a GaAs (gallium arsenide) substrate.
- FIG. 4 shows the front surface S1 of the substrate 21 facing the ⁇ Z direction and the rear surface S2 of the substrate 21 facing the +Z direction.
- the front surface S1 and back surface S2 shown in FIG. 4 are perpendicular to the Z direction.
- the front surface S1 is the bottom surface of the substrate 21, and the back surface S2 is the top surface of the substrate 21.
- Substrate 21 is an example of the first semiconductor substrate of the present disclosure.
- the laminated film 22 includes multiple layers laminated on the surface S1 of the substrate 21 . Examples of these layers are an n-type semiconductor layer, an active layer, a p-type semiconductor layer, a light reflecting layer, an insulating layer with an exit window for light, and the like.
- the laminated film 22 includes a plurality of post portions P projecting in the -Z direction. Some of these post portions P are the plurality of light emitting elements 23 .
- the light emitting element 23 is provided on the surface S1 of the substrate 21 as part of the laminated film 22 .
- the light emitting element 23 of this embodiment has a VCSEL structure and emits light in the +Z direction. Light emitted from the light emitting element 23 passes through the substrate 21 from the front surface S1 to the rear surface S2 of the substrate 21, and enters the correction lens 16 from the substrate 21, as shown in FIG.
- the LD chip 11 of this embodiment is a back emission type VCSEL chip.
- the light emitting element 23 is also called a mesa portion. Light emitting element 23 is an example of a semiconductor element of the present disclosure.
- Each anode electrode 24 is formed on the lower surface of the corresponding light emitting element 23 .
- the cathode electrode 25 is formed continuously on the lower surface and side surfaces of the post portions P other than the light emitting elements 23 and the lower surface of the laminated film 22 between the post portions P.
- the LD chip 11 of this embodiment has a plurality of anode electrodes 24 and one cathode electrode 25 .
- Each light emitting element 23 emits light when a current flows between the corresponding anode electrode 24 and cathode electrode 25 .
- the anode electrode 24 is an example of the first electrode of the present disclosure
- the cathode electrode 25 is an example of the second electrode of the present disclosure.
- the LD chip 11 is arranged on the LDD substrate 12 via the bumps 18 and electrically connected to the LDD substrate 12 by the bumps 18 .
- connection pads 32 are formed on a substrate 31 included in the LDD substrate 12
- post portions P are arranged on the connection pads 32 via bumps 18 .
- Each post part P is arranged on the bump 18 via the anode electrode 24 or the cathode electrode 25 .
- the bump 18 under the anode electrode 24 is an example of the first connection portion of the present disclosure
- the bump 18 under the cathode electrode 25 is an example of the second connection portion of the present disclosure.
- the substrate 31 is, for example, a semiconductor substrate such as a Si (silicon) substrate.
- Substrate 31 is an example of the second semiconductor substrate of the present disclosure.
- a connection pad 32 is formed on the substrate 31 .
- the connection pads 32 are made of metal such as copper (Cu), for example.
- the connection pad 32 under the anode electrode 24 is an example of the first pad of the present disclosure
- the connection pad 32 under the cathode electrode 25 is an example of the second pad of the present disclosure.
- the LDD substrate 12 includes the driving section 3 that drives the light emitting section 2 in the LD chip 11 as described above.
- FIG. 4 schematically shows a plurality of switches SW inside the driving section 3. As shown in FIG. Each switch SW is electrically connected to the corresponding light emitting element 23 via the bump 18 .
- the drive unit 3 of the present embodiment can control (turn on/off) these switches SW individually. Therefore, the driving section 3 can drive the plurality of light emitting elements 23 individually. This makes it possible to precisely control the light emitted from the light emitting section 2, for example, by causing only the light emitting element 23 required for distance measurement to emit light.
- Such individual control of the light emitting elements 23 can be realized by arranging the LDD substrate 12 below the LD chip 11, thereby making it easier to electrically connect each light emitting element 23 to the corresponding switch SW. ing.
- FIG. 5 is a plan view and cross-sectional view showing the structure of the light emitting device 1a of the first embodiment.
- FIG. 5A shows the planar structure of the light emitting device 1a of this embodiment. Similar to FIG. 4, FIG. 5B shows a vertical cross section of the light emitting device 1a of this embodiment. FIG. 5B shows a longitudinal section along line A-A' shown in FIG. 5A. The structure of the light emitting device 1a of this embodiment will be described below with reference to FIGS. 5A and 5B.
- the LD chip 11 includes a substrate 21, a laminated film 22, a plurality of light emitting elements 23, a plurality of anode electrodes 24, and a cathode electrode 25, as shown in FIGS. 5A and 5B.
- 5A shows the planar shape of four light emitting elements 23 in the LD chip 11, and
- FIG. 5B shows the vertical cross section of two of these light emitting elements 23.
- FIG. FIG. 5A shows the shape of the anode electrode 24 with a dotted line and the shape of the cathode electrode 25 with a broken line.
- 5A and 5B further show two post portions P other than the light emitting element 23.
- the LDD substrate 12 includes a substrate 31, a plurality of connection pads 32, a plurality of plugs 33, a plurality of wirings 34, an interlayer insulating film 35, and a plurality of transistors Tr. , and a plurality of capacitors Cp.
- dashed lines indicate a rough range in which the transistor Tr is provided.
- Each anode electrode 24 of the present embodiment has a circular shape in a plan view, as shown in FIG. 5A.
- the cathode electrode 25 of this embodiment has a rectangular shape in a plan view, as shown in FIG. 5A. The two long sides of this rectangle are parallel to the X direction, and the two short sides of this rectangle are parallel to the Y direction. Therefore, the cathode electrode 25 extends in the X direction in plan view.
- This X direction is an example of the first direction in the present disclosure.
- the cathode electrode 25 of this embodiment has an opening at the position of each anode electrode 24 in plan view. Therefore, the planar shape of the cathode electrode 25 shown in FIG. 5A is a rectangle having four circular openings. As a result, the cathode electrode 25 has a shape surrounding each anode electrode 24 in plan view. The plurality of anode electrodes 24 and cathode electrodes 25 of this embodiment are separated from each other.
- each anode electrode 24 may be other than circular.
- the planar shape of the cathode electrode 25 may be other than rectangular.
- the upper left light emitting element 23 is electrically connected to the left capacitor Cp via the upper left transistor Tr.
- the lower left light emitting element 23 is electrically connected to the left capacitor Cp via the lower left transistor Tr.
- the upper right light emitting element 23 is electrically connected to the right capacitor Cp via the upper right transistor Tr.
- the lower right light emitting element 23 is electrically connected to the right capacitor Cp via the lower right transistor Tr.
- each light emitting element 23 is electrically connected to the corresponding capacitor Cp via the corresponding transistor Tr.
- Each transistor Tr of this embodiment functions as the switch SW described above (FIG. 4). Therefore, each transistor Tr can drive the corresponding light emitting element 23 .
- FIGS. 5A and 5B show current paths A1 to A4 of current flowing through the upper left light emitting element 23 and current paths B1 to B4 of current flowing through the upper right light emitting element 23.
- FIG. A current path A1 indicates a path from the connection pad 32 under the cathode electrode 25 to the connection pad 32 under the anode electrode 24 .
- a current path A2 indicates a path within the connection pad 32, the plug 33, the transistor Tr, and the wiring .
- a current path A3 indicates a path within the wiring 34 .
- a current path A4 indicates a path within capacitor Cp and connection pad 32 .
- the current path (not shown) of the current flowing through the lower left light emitting element 23 is the same as the current paths A1 to A4 of the current flowing through the upper left light emitting element 23 .
- a current path (not shown) of current flowing through the lower right light emitting element 23 is the same as the current paths B1 to B4 of current flowing through the upper right light emitting element 23 . Further details of the current paths A1-A4, etc. will be described later.
- the LDD substrate 12 includes a plurality of wirings 34, a plurality of plugs 33, and a plurality of connection pads 32 which are sequentially formed on a substrate 31, as shown in FIGS. 5A and 5B. These wirings 34 , plugs 33 and connection pads 32 are provided within an interlayer insulating film 35 formed on the substrate 31 .
- the interlayer insulating film 35 is an example of the insulating film of the present disclosure.
- the LDD substrate 12 further includes a plurality of transistors Tr and a plurality of capacitors Cp formed on the substrate 31 and provided within the interlayer insulating film 35 .
- FIG. 5A shows four wirings 34 corresponding to four light emitting elements 23.
- FIG. These wirings 34 extend in the X direction in plan view. This X direction is an example of the second direction of the present disclosure. Further details of the light emitting element 23 and the wiring 34 will be described below using the upper left light emitting element 23 and the upper left wiring 34 as an example.
- FIG. 5B shows the upper left light emitting element 23 and the upper left wiring 34, and the plug 33, the connection pad 32, the bump 18, and the anode electrode 24 which are provided in order on the upper left wiring 34.
- This bump 18 is an example of the first connecting portion of the present disclosure.
- the upper left light emitting element 23 is provided on this anode electrode 24 .
- the upper left wiring 34 is electrically connected to the left capacitor Cp and the lower left transistor Tr, and connects the left capacitor Cp and the lower left transistor Tr in series.
- This capacitor Cp is provided in the interlayer insulating film 35 in the same manner as the wiring 34 , plug 33 and connection pad 32 . Therefore, this capacitor Cp is provided at a position lower than each bump 18 between the LD chip 11 and the LDD substrate 12 . Also, this capacitor Cp is arranged on the left side (-X direction) of the upper left wiring 34 in plan view.
- This capacitor Cp is electrically connected to the cathode electrode 25 via the connection pad 32 and the bump 18, as shown in FIG. 5B. As a result, current paths A1 to A4 are formed for this capacitor Cp.
- This bump 18 is an example of the second connection portion of the present disclosure.
- FIG. 5A shows four bumps 18 electrically connected to the cathode electrode 25, one of these bumps 18 forming a current path A1-A4.
- FIG. A current path A1 indicates a path from the connection pad 32 under the cathode electrode 25 to the connection pad 32 under the anode electrode 24 .
- a current path A2 indicates a path within the connection pad 32, the plug 33, the transistor Tr, and the wiring .
- a current path A3 indicates a path within the wiring 34 .
- a current path A4 indicates a path within capacitor Cp and connection pad 32 . The same applies to the current paths B1 to B4.
- the current path A1 is located on a straight line connecting the center of the bump 18 under the cathode electrode 25 and the center of the bump 18 under the anode electrode 24 in plan view. Therefore, the current in the current path A1 flows parallel to the X direction in plan view.
- the above straight line is located on the A-A' line indicated by A in FIG.
- the current path A2 is located on the side surface F of the wiring 34 in plan view. The reason is that the current in wire 34 generally flows along side F of wire 34 .
- the current path A2 is located on the +Y direction side F of the wiring 34 in FIG. 5A, but may be located on the -Y direction side F of the wiring 34. FIG. That is, the current in the current path A2 may flow along the side F of the wiring 34 in the +Y direction or may flow along the side F of the wiring 34 in the -Y direction. In this embodiment, since the wiring 34 extends in the Y direction, the current in the wiring 34 flows parallel to the Y direction.
- the current path A3 is located on the side surface F of the wiring 34 in plan view. The reason is the same as for the current path A2. Note that in FIG. 5A there are traces 34 below the connection pads 32 .
- the current path A4 extends from the end point of the current path A3 to the start point of the current path A1 in plan view.
- the current path A4 in the connection pad 32 is located on the line A-A' in plan view, like the current path A1.
- the current paths A1 to A4 shown in A of FIG. 5 have an elongated rectangular shape in plan view.
- This rectangle has a shape whose long sides are significantly longer than its short sides. Advantages of the current paths A1 to A4 having such shapes will be described later.
- the planar shape of the current paths A1 to A4 may be other than rectangular.
- FIG. 6 is a cross-sectional view and a plan view showing the structure of a light-emitting device 1a of a comparative example.
- FIG. 6A shows a vertical cross section of the light emitting device 1a of this comparative example.
- FIG. 6B shows the planar structure of the light emitting device 1a of this comparative example.
- FIG. 6A shows a longitudinal section along line A-A' shown in FIG. 6B. The structure of the light emitting device 1a of this comparative example will be described below with reference to FIGS. 6A and 6B.
- the light emitting device 1a of this comparative example has the same components as the light emitting device 1a of the first embodiment.
- the capacitor Cp of this comparative example is arranged in the ⁇ Y direction of the light emitting element 23 in a plan view, as shown in FIG. 6B. Therefore, the wiring 34 of this comparative example extends in the Y direction in plan view.
- the current paths A1 to A4 of this comparative example have a planar shape different from the planar shape of the current paths A1 to A4 of the first embodiment, as shown in FIG. 6B.
- the current paths A1 to A4 in the first embodiment have an elongated rectangular shape in plan view, but the current paths A1 to A4 in this comparative example have a non-elongated rectangular shape in plan view. have.
- most of the current path A2 in the first embodiment is parallel to the current path A1 in plan view, but the current path A2 in this comparative example is perpendicular to the current path A1 in plan view. .
- the current path A1 in this comparative example is arranged far from most of the current paths A2 to A4. Therefore, the magnetic field generated by the current in the current path A1 is less likely to cancel out the magnetic field generated by the currents in the current paths A2 to A4. As a result, a large parasitic inductance occurs between the LD chip 11 and the LDD substrate 12 of this comparative example.
- the current path A1 of the first embodiment is arranged near most of the current paths A2 to A4. Therefore, the magnetic field generated by the current in the current path A1 tends to cancel out the magnetic field generated by the currents in the current paths A2 to A4. Therefore, according to this embodiment, the parasitic inductance between the LD chip 11 and the LDD substrate 12 can be reduced. For example, according to this embodiment, the parasitic inductance between the LD chip 11 and the LDD substrate 12 can be reduced to about a fraction of that in the comparative example.
- FIG. 7 is a circuit diagram and graph for explaining the problem of the light emitting device 1a of the first embodiment.
- FIG. 7A shows an equivalent circuit of the light emitting device 1a of this embodiment.
- the equivalent circuit shown in A of FIG. and the parasitic inductance Z between FIG. 7A further shows the current Iv (VCSEL current) flowing in the circuit.
- a curve C1 indicates the current Iv when the parasitic inductance Z is small, and a curve C2 indicates the current Iv when the parasitic inductance Z is large.
- Symbols ⁇ t and Th represent the rising delay and rising threshold of the current Iv, respectively.
- FIG. 8 is a circuit diagram for explaining the details of the operation of the light emitting device 1a of the first embodiment.
- FIG. 8 shows an equivalent circuit of the light emitting device 1a of this embodiment.
- the equivalent circuit shown in FIG. 8 includes the light emitting element 23 in the LD chip 11, the transistor Tr in the LDD substrate 12, the capacitor Cp in the LDD substrate 12, and the like.
- FIG. 8 further shows the current paths A1-A4 between these components.
- the magnetic field generated by the current in the current path A1 tends to cancel out the magnetic field generated by the currents in the current paths A2 to A4. Therefore, according to this embodiment, the parasitic inductance between the LD chip 11 and the LDD substrate 12 can be reduced.
- FIG. 9 is a plan view and cross-sectional view for explaining the details of the structure of the light emitting device 1a of the first embodiment.
- FIG. 9A shows a configuration example of the capacitor Cp.
- the capacitor Cp is provided within the interlayer insulating film 35 on the substrate 31 (B in FIG. 5).
- capacitor Cp comprises electrode 41 and electrode 42 . These electrodes 41 and 42 are formed within the interlayer insulating film 35 .
- a capacitor Cp shown in FIG. 9A is composed of these electrodes 41 and 42 and an interlayer insulating film 35 between these electrodes 41 and 42 .
- the electrode 41 includes a common portion 41a electrically connected to the connection pad 32 and a plurality of tip portions 41b extending from the common portion 41a.
- electrode 42 includes a common portion 42a electrically connected to wire 34 and a plurality of tip portions 42b extending from common portion 42a.
- the electrodes 41 and 42 constitute a comb-shaped electrode in which a plurality of tip portions 41b and a plurality of tip portions 42b are alternately arranged in plan view. This makes it possible to increase the capacitance of the capacitor Cp.
- Electrodes 41, 42 are examples of third and fourth electrodes of the present disclosure.
- the capacitor Cp by adopting the capacitor Cp having such a structure, the capacitor Cp can be manufactured by a semiconductor manufacturing process in the same manner as the connection pad 32, the plug 33, the wiring 34, the interlayer insulating film 35, and the like. becomes possible.
- the capacitor Cp may have a structure other than the structure shown in FIG. 9A.
- FIG. 9B shows a configuration example of the transistor Tr.
- the transistor Tr is provided within the interlayer insulating film 35 on the substrate 31 (B in FIG. 5).
- the transistor Tr includes a gate insulating film 43, a gate electrode 44, one diffusion layer 45, and the other diffusion layer 46, forming a MOS transistor.
- a gate insulating film 43 is formed on the substrate 31 .
- a gate electrode 44 is formed on the gate insulating film 43 .
- the diffusion layers 45 and 46 are formed in the substrate 31 so as to sandwich the gate electrode 44, and function as source and drain regions of the transistor Tr.
- the gate insulating film 43 and the gate electrode 44 are provided within the interlayer insulating film 35 on the substrate 31 .
- a portion of wiring 34 is electrically connected to diffusion layer 45 and another portion of wiring 34 is electrically connected to diffusion layer 46 .
- the transistor Tr is arranged on the wiring 34 .
- the wiring 34 shown in FIG. 9B includes a contact plug provided on the diffusion layer 45, a contact plug provided on the diffusion layer 46, and two wirings in the wiring layer provided on these contact plugs. and One wiring in this wiring layer is electrically connected to the diffusion layer 45 and the capacitor Cp (not shown), and the other wiring in this wiring layer is electrically connected to the diffusion layer 46 and the plug 33 (not shown). It is connected to the.
- the transistor Tr and the wiring 34 may have structures other than the structure shown in FIG. 9B.
- the wiring 34 may be formed of a plurality of wirings in two or more wiring layers included in the interlayer insulating film 35 .
- FIG. 10 is a plan view for explaining the details of the structure of the light emitting device 1a of the first embodiment.
- the direction (first direction) in which the cathode electrode 25 of this embodiment extends in plan view is the X direction, and the wiring 34 in this embodiment extends in plan view.
- the extending direction (second direction) is also the X direction. Therefore, the second direction in this embodiment is parallel to the first direction.
- this "parallel" does not have to be mathematically strict "parallel". For example, if the second direction is parallel to the first direction, not only if the second direction is mathematically strictly parallel to the first direction, but also if the second direction is parallel to the first direction by a degree of manufacturing error. This includes cases where it is different from This will be explained with reference to FIG.
- FIG. 10 shows the angle ⁇ between the direction in which the cathode electrode 25 extends in plan view (first direction) and the direction in which the wiring 34 extends in plan view (second direction) (0 degrees ⁇ 180 Every time).
- the second direction coincides with the X direction
- the first direction is inclined at an angle ⁇ with respect to the X direction.
- the angle ⁇ in this embodiment is 5 degrees or less.
- that the second direction in this embodiment is parallel to the first direction corresponds to the angle ⁇ being 5 degrees or less.
- the parasitic inductance between the LD chip 11 and the LDD substrate 12 can be reduced by arranging the cathode electrode 25 and the wiring 34 so that the angle ⁇ is 5 degrees or less. Become. Further, according to the present embodiment, by allowing an error of 5 degrees or less in the angle ⁇ , it is possible to improve the degree of freedom in designing the light emitting device 1a.
- FIG. 10 shows current paths A1 to A4, similar to A and B in FIGS.
- the current path A2 is also tilted with respect to the X direction.
- the magnetic field generated by the current in the current path A1 can be effectively canceled out with the magnetic field generated by the currents in the current paths A2 to A4.
- 11A and 11B are a plan view and a cross-sectional view showing the structure of a light-emitting device 1a according to a modification of the first embodiment.
- FIG. 11A shows the planar structure of the light emitting device 1a of this modified example.
- B of FIG. 11 shows a longitudinal section of the light emitting device 1a of this modified example.
- FIG. 11B shows a longitudinal section along the line A-A' shown in FIG. 11A. The structure of the light-emitting device 1a of this modification will be described below with reference to FIGS. 11A and 11B.
- the light emitting device 1a of this modified example has the same components as the light emitting device 1a of the first embodiment (see FIGS. 5A and 5B).
- FIG. 11A shows a configuration example of a light-emitting device 1a including five or more light-emitting elements 23.
- FIG. 11A shows an arrangement example of 16 light emitting elements 23, and
- FIG. 11B shows four of these light emitting elements 23.
- FIG. 11A shows a configuration example of a light-emitting device 1a including five or more light-emitting elements 23.
- FIG. 11A shows an arrangement example of 16 light emitting elements 23, and FIG. 11B shows four of these light emitting elements 23.
- a and B of FIG. 11 show current paths A1' and A2' in addition to the current paths A1 to A4.
- the current paths A1-A4, A1', A2' include two light emitting elements 23.
- the left light emitting element 23 and the right light emitting element 23 are connected in parallel with the left capacitor Cp by current paths A1 to A4, A1', A2'.
- the 16 light-emitting elements 23 shown in A of FIG. 11 constitute eight light-emitting element groups, and each light-emitting element group includes two light-emitting elements 23 .
- Two light emitting elements 23 in each light emitting element group are connected in parallel with the left or right capacitor Cp.
- the left light emitting element 23 and the right light emitting element 23 constitute one of eight light emitting element groups, and are connected in parallel with the left capacitor Cp.
- the current path A1 is located on a straight line connecting the bump 18 under the cathode electrode 25 and the bump 18 under the anode electrode 24 of the left light emitting element 23 in plan view.
- the current path A1′ is located on a straight line connecting the bump 18 under the anode electrode 24 of the left light emitting element 23 and the bump 18 under the anode electrode 24 of the right light emitting element 23 in plan view.
- part of the current path A1' has a semicircular shape near the left light emitting element 23 in order to bypass the left light emitting element 23.
- FIG. Therefore, the currents in the current paths A1 and A1' generally flow parallel to the X direction in plan view.
- the current path A1' detours the left light emitting element 23 in the +Y direction in FIG. 11A
- the current path A1' may detour the left light emitting element 23 in the -Y direction instead.
- the current paths A2 and A2' are located on the side surface F of the wiring 34 in plan view. However, in FIG. 11A, the current paths A2 and A2' are separated from the side surface F of the wiring 34 in order to avoid overlapping of the current paths A1 and A1' and the current paths A2 and A2'. Illustrated. Actually, the current paths A2 and A2' are located on the side surface F of the wiring 34 in the -Y direction in plan view. Note that the current paths A2 and A2' may be positioned on the +Y-direction side face F of the wiring 34 . In this modification, since the wiring 34 extends in the Y direction, the current in the wiring 34 flows parallel to the Y direction.
- FIG. 11A omits illustration of a portion near the end point of the current path A1 and a portion near the start point of the current path A2 in order to avoid making the drawing difficult to see.
- the vicinity of the end point of the current path A1 extends to the start point of the current path A2.
- the current path A3 is located on the side surface F of the wiring 34 in plan view. However, in FIG. 11A, the current path A3 is separated from the side surface F of the wiring 34 in order to avoid overlapping of the current paths A1 and A3. Actually, the current path A3 is located on the side surface F of the wiring 34 in the -Y direction in plan view. Note that the current path A3 may be positioned on the side surface F of the wiring 34 in the +Y direction.
- the current path A4 extends from the end point of the current path A3 to the start point of the current path A1 in plan view.
- the current path A4 in the connection pad 32 is located on the line A-A' in plan view, like the current paths A1 and A1'.
- the current paths A1 to A4, A1', A2' shown in A of FIG. 11 have two elongated rectangular shapes in plan view. Each of these rectangles has a shape in which the long sides are significantly longer than the short sides. Therefore, according to this modification, the parasitic inductance between the LD chip 11 and the LDD substrate 12 can be reduced.
- the left light emitting element 23 and the right light emitting element 23 may be controlled by one transistor Tr provided on the wiring 34, or may be controlled by two transistors Tr provided on the wiring 34. good. That is, the left light emitting element 23 and the right light emitting element 23 may be controlled by the same single transistor Tr, or may be controlled by two different transistors Tr. The same applies to the other 14 light emitting elements 23 shown in A of FIG.
- FIG. 12 is a plan view for explaining the details of the structure of the light emitting device 1a of the modified example of the first embodiment.
- FIG. 12A shows the layout of a plurality of light emitting elements 23 included in the light emitting device 1a of this modified example, similar to FIG. 11A.
- these light emitting elements 23 are arranged in a two-dimensional array.
- these light emitting elements 23 are arranged in a triangular lattice pattern in FIG. 12A, they may be arranged in another layout (for example, a square lattice pattern).
- a of FIG. 12 shows a straight line L1 passing between these light emitting elements 23 .
- each light emitting element 23 positioned in the +X direction of the straight line L1 is electrically connected to the right capacitor Cp, and each light emitting element 23 positioned in the ⁇ X direction of the straight line L1 is connected to the left capacitor Cp. electrically connected.
- the parasitic inductance between the LD chip 11 and the LDD substrate 12 can be reduced.
- FIG. 12A further shows the pitch "X” between the light emitting elements 23 in the X direction and the pitch “Y” between the light emitting elements 23 in the Y direction. Since the light emitting elements 23 of this modification are arranged in a triangular lattice, the pitch "X” is the base of one triangle that forms the triangular lattice, and the pitch “Y” forms the triangular lattice. It is the height of one triangle that
- FIG. 12B shows the layout of the plurality of light emitting elements 23 included in the light emitting device 1a of the comparative example of this embodiment.
- two capacitors Cp are arranged in the ⁇ Y direction of the light emitting element 23 .
- each light emitting element 23 positioned in the +Y direction of the straight line L2 is electrically connected to the upper capacitor Cp, and each light emitting element 23 positioned in the ⁇ Y direction of the straight line L2 is connected to the lower capacitor Cp. electrically connected.
- the parasitic inductance between the LD chip 11 and the LDD substrate 12 increases.
- the direction in which the wiring 34 extends in plan view is parallel to the direction in which the cathode electrode 25 extends in plan view (first direction).
- a capacitor Cp and the like are arranged. Therefore, according to this embodiment, it is possible to reduce the parasitic inductance between the LD chip 11 and the LDD substrate 12 by canceling out the magnetic fields generated by the currents.
- FIG. 13 is a cross-sectional view showing the structure of the light emitting device 1a of the second embodiment.
- FIG. 13 shows a longitudinal section of the light emitting device 1a of this embodiment.
- the light emitting device 1a of this embodiment has the same components as the light emitting device 1a of the first embodiment (see B in FIG. 5).
- the capacitor Cp of this embodiment is a mounted component arranged on the substrate 31 .
- the capacitor Cp of this embodiment is, for example, a commercially available capacitor.
- each capacitor Cp is arranged on the interlayer insulating film 35 .
- One electrode (not shown) of each capacitor Cp is electrically connected to the cathode electrode 25 via the connection pad 32 and the bump 18 .
- the other electrode (not shown) of each capacitor Cp is electrically connected to the anode electrode 24 via two connection pads 32 , two plugs 33 , wiring 34 and bump 18 .
- the capacitor Cp can be easily prepared by purchasing the capacitor Cp without manufacturing it yourself.
- capacitor Cp may be manufactured without using a semiconductor manufacturing process.
- FIG. 14 is a plan view showing the structure of the light emitting device 1a of the third embodiment.
- FIG. 14 shows the planar structure of the light emitting device 1a of this embodiment.
- the light emitting device 1a of this embodiment has the same components as the light emitting device 1a of the first embodiment (see A in FIG. 5).
- FIG. 14 shows the width W in the Y direction of the substrate 21 and the cathode electrode 25 of this embodiment.
- FIG. 14 further shows the distance D between the current paths A1 and A2 in plan view.
- the current path A1 is positioned on a straight line connecting the center of the bump 18 under the cathode electrode 25 and the center of the bump 18 under the anode electrode 24 in plan view.
- the current path A2 is positioned on the side surface F of the wiring 32 in plan view. Therefore, the distance D corresponds to the distance between the straight line and the side surface F.
- the distance D is set to be equal to or less than the width W (D ⁇ W).
- the capacitors Cp are arranged in the ⁇ X directions of the light emitting element 23, such setting can be realized.
- the distance D is set to be equal to or less than the width W, the current path A1 and the current path A2 can be brought closer to each other, and the parasitic inductance between the LD chip 11 and the LDD substrate 12 can be effectively reduced. can be effectively reduced.
- the width of the substrate 21 in the Y direction and the width of the cathode electrode 25 in the Y direction may be different from each other.
- the distance D may be less than or equal to the width of both of them, or less than or equal to the width of only one of them.
- FIG. 14 also shows the pitch E between the light emitting elements 23 in the Y direction.
- This Y direction is an example of the third direction of the present disclosure.
- the distance D is set to be equal to or less than the pitch E (D ⁇ E).
- the capacitors Cp are arranged in the ⁇ X directions of the light emitting element 23, such setting can be realized.
- the distance D is set to be equal to or less than the pitch E, the current path A1 and the current path A2 can be brought closer to each other, and the parasitic inductance between the LD chip 11 and the LDD substrate 12 can be reduced. It becomes possible to reduce it more effectively.
- the light emitting elements 23 of this embodiment may be arranged in any two-dimensional layout.
- the pitch E shown in FIG. 14 becomes the pitch "Y" shown in A of FIG.
- the light emitting device 1a of the first to third embodiments is used as the light source of the distance measuring device 1, it may be used in other modes.
- the light-emitting device 1a of these embodiments may be used as a light source for optical equipment such as a printer, or may be used as a lighting device.
- a first substrate including a semiconductor element, a first electrode provided on the semiconductor element, and a second electrode extending in a first direction in plan view; a second substrate including a wiring extending in a second direction parallel to the first direction in plan view, a transistor electrically connected to the wiring, and a capacitor electrically connected to the wiring; a first connection portion electrically connecting the first electrode and the second substrate; a second connection portion electrically connecting the second electrode and the second substrate;
- a semiconductor device comprising
- the second substrate is a first pad electrically connected to the first connection portion and the transistor; a second pad electrically connected to the second connection portion and the capacitor;
- said first substrate further comprising a first semiconductor substrate comprising gallium and arsenic; wherein the second substrate further comprises a second semiconductor substrate comprising silicon;
- the semiconductor device according to (1)
- the second substrate further includes a semiconductor substrate, an insulating film provided on the semiconductor substrate, and third and fourth electrodes provided in the insulating film;
- the second substrate further includes a semiconductor substrate;
- the distance between the straight line connecting the first connection portion and the second connection portion and the side surface of the wiring is the distance between the plurality of semiconductor elements in the third direction perpendicular to the first direction.
- the semiconductor device according to (1) which is equal to or less than the pitch.
- a light-emitting unit that includes a light-emitting element that generates light and irradiates a subject with light from the light-emitting element; a light receiving unit that receives light reflected from the subject; a distance measuring unit that measures the distance to the subject based on the light received by the light receiving unit;
- the light emitting unit a first substrate including a semiconductor element, a first electrode provided on the semiconductor element, and a second electrode extending in a first direction in plan view; a second substrate including a wiring extending in a second direction parallel to the first direction in plan view, a transistor electrically connected to the wiring, and a capacitor electrically connected to the wiring; a first connection portion electrically connecting the first electrode and the second substrate; a second connection portion electrically connecting the second electrode and the second substrate; A ranging device.
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Abstract
Description
(1)第1実施形態の測距装置1
(1.1)測距装置1の構成
図1は、第1実施形態の測距装置1の構成例を示すブロック図である。
測距装置1における測距手法としては、例えばSTL(Structured Light:構造化光)方式やToF(Time of Flight:光飛行時間)方式による測距手法を採用することができる。
図3は、第1実施形態の発光装置1aの構造の例を示す断面図である。本実施形態の発光装置1aは、測距装置1の一部でもよいし、測距装置1そのものでもよい。発光装置1aは、本開示の半導体装置の例である。
本実施形態の各アノード電極24は、図5のAに示すように、平面視で円形の形状を有している。一方、本実施形態のカソード電極25は、図5のAに示すように、平面視で長方形の形状を有している。この長方形の2つの長辺は、X方向に平行となっており、この長方形の2つの短辺は、Y方向に平行となっている。よって、カソード電極25は、平面視でX方向に延びている。このX方向は、本開示の第1方向の例である。
図5のAに示す4つの発光素子23に関し、左上の発光素子23と左下の発光素子23は、左のキャパシタCpと電気的に接続されている。一方、右上の発光素子23と右下の発光素子23は、右のキャパシタCpと電気的に接続されている。
LDD基板12は、図5のAおよびBに示すように、基板31上に順に形成された複数の配線34、複数のプラグ33、および複数の接続パッド32を備えている。これらの配線34、プラグ33、および接続パッド32は、基板31上に形成された層間絶縁膜35内に設けられている。層間絶縁膜35は、本開示の絶縁膜の例である。LDD基板12はさらに、基板31上に形成され、層間絶縁膜35内に設けられた複数のトランジスタTrおよび複数のキャパシタCpを備えている。
図5のAおよびBは、左上の発光素子23を流れる電流の電流経路A1~A4と、右上の発光素子23を流れる電流の電流経路B1~B4とを示している。電流経路A1は、カソード電極25下の接続パッド32から、アノード電極24下の接続パッド32までの経路を示している。電流経路A2は、接続パッド32、プラグ33、トランジスタTr、および配線34内の経路を示している。電流経路A3は、配線34内の経路を示している。電流経路A4は、キャパシタCpおよび接続パッド32内の経路を示している。これは、電流経路B1~B4についても同様である。
図13は、第2実施形態の発光装置1aの構造を示す断面図である。
図14は、第3実施形態の発光装置1aの構造を示す平面図である。
図14はさらに、平面視における電流経路A1と電流経路A2との間の距離Dを示している。電流経路A1は、平面視で、カソード電極25下のバンプ18の中心と、アノード電極24下のバンプ18の中心とを結ぶ直線上に位置している。電流経路A2は、平面視で、配線32の側面F上に位置している。よって、距離Dは、当該直線と側面Fとの間の距離に相当する。
図14はさらに、発光素子23間のY方向のピッチEを示している。このY方向は、本開示の第3方向の例である。
半導体素子と、前記半導体素子に設けられた第1電極と、平面視で第1方向に延びる第2電極とを含む第1基板と、
平面視で前記第1方向と平行な第2方向に延びる配線と、前記配線と電気的に接続されたトランジスタと、前記配線と電気的に接続されたキャパシタとを含む第2基板と、
前記第1電極と前記第2基板とを電気的に接続する第1接続部分と、
前記第2電極と前記第2基板とを電気的に接続する第2接続部分と、
を備える半導体装置。
前記半導体素子は、発光素子である、(1)に記載の半導体装置。
前記第2電極は、平面視で前記第1電極を包囲する形状を有する、(1)に記載の半導体装置。
前記第2電極は、平面視で長方形の形状を有する、(1)に記載の半導体装置。
前記トランジスタと前記キャパシタは、前記配線により直列に接続されている、(1)に記載の半導体装置。
前記トランジスタは、前記半導体素子を駆動するスイッチとして機能する、(1)に記載の半導体装置。
前記キャパシタは、平面視で前記配線の前記第2方向に設けられている、(1)に記載の半導体装置。
前記第2基板は、
前記第1接続部分および前記トランジスタと電気的に接続された第1パッドと、
前記第2接続部分および前記キャパシタと電気的に接続された第2パッドと、
をさらに含む、(1)に記載の半導体装置。
前記第1基板は、ガリウムおよびヒ素を含む第1半導体基板をさらに含み、
前記第2基板は、シリコンを含む第2半導体基板をさらに含む、
(1)に記載の半導体装置。
前記第2電極内の電流は、平面視で前記第1方向に平行に流れる、(1)に記載の半導体装置。
前記第2電極内の電流は、平面視で前記第1接続部分と前記第2接続部分とを結ぶ直線上を流れる、(10)に記載の半導体装置。
前記配線内の電流は、平面視で前記第2方向に平行に流れる、(1)に記載の半導体装置。
前記配線内の電流は、平面視で前記配線の側面に沿って流れる、(12)に記載の半導体装置。
前記第1方向と前記第2方向との間の角度は、5度以下である、(1)に記載の半導体装置。
前記キャパシタは、前記第1および第2接続部分よりも低い位置に設けられている、(1)に記載の半導体装置。
前記第2基板は、半導体基板と、前記半導体基板上に設けられた絶縁膜と、前記絶縁膜内に設けられた第3および第4電極とをさらに含み、
前記キャパシタは、前記第3および第4電極を含む、(1)に記載の半導体装置。
前記第2基板は、半導体基板をさらに含み、
前記キャパシタは、前記半導体基板上に設けられた実装部品である、(1)に記載の半導体装置。
平面視において、前記第1接続部分と前記第2接続部分とを結ぶ直線と、前記配線の側面との間の距離は、前記第2電極の幅以下である、(1)に記載の半導体装置。
平面視において、前記第1接続部分と前記第2接続部分とを結ぶ直線と、前記配線の側面との間の距離は、前記第1方向に垂直な第3方向における複数の前記半導体素子間のピッチ以下である、(1)に記載の半導体装置。
光を発生させる発光素子を含み、前記発光素子からの光を被写体に照射する発光部と、
前記被写体から反射した光を受光する受光部と、
前記受光部により受光された光に基づいて、前記被写体との距離を測定する測距部とを備え、
前記発光部は、
半導体素子と、前記半導体素子に設けられた第1電極と、平面視で第1方向に延びる第2電極とを含む第1基板と、
平面視で前記第1方向と平行な第2方向に延びる配線と、前記配線と電気的に接続されたトランジスタと、前記配線と電気的に接続されたキャパシタとを含む第2基板と、
前記第1電極と前記第2基板とを電気的に接続する第1接続部分と、
前記第2電極と前記第2基板とを電気的に接続する第2接続部分と、
を備える、測距装置。
4:電源回路、5:発光側光学系、6:受光側光学系、7:受光部、
8:信号処理部、9:制御部、9a:測距部、10:温度検出部、
11:LDチップ、12:LDD基板、13:実装基板、14:放熱基板、
15:補正レンズ保持部、16:補正レンズ、17:配線、18:バンプ、
21:基板、22:積層膜、23:発光素子、
24:アノード電極、25:カソード電極、
31:基板、32:接続パッド、33:プラグ、34:配線、35:層間絶縁膜、
41:電極、41a:共通部分、41b:先端部分、
42:電極、42a:共通部分、42b:先端部分、
43:ゲート絶縁膜、44:ゲート電極、45:拡散層、46:拡散層
Claims (20)
- 半導体素子と、前記半導体素子に設けられた第1電極と、平面視で第1方向に延びる第2電極とを含む第1基板と、
平面視で前記第1方向と平行な第2方向に延びる配線と、前記配線と電気的に接続されたトランジスタと、前記配線と電気的に接続されたキャパシタとを含む第2基板と、
前記第1電極と前記第2基板とを電気的に接続する第1接続部分と、
前記第2電極と前記第2基板とを電気的に接続する第2接続部分と、
を備える半導体装置。 - 前記半導体素子は、発光素子である、請求項1に記載の半導体装置。
- 前記第2電極は、平面視で前記第1電極を包囲する形状を有する、請求項1に記載の半導体装置。
- 前記第2電極は、平面視で長方形の形状を有する、請求項1に記載の半導体装置。
- 前記トランジスタと前記キャパシタは、前記配線により直列に接続されている、請求項1に記載の半導体装置。
- 前記トランジスタは、前記半導体素子を駆動するスイッチとして機能する、請求項1に記載の半導体装置。
- 前記キャパシタは、平面視で前記配線の前記第2方向に設けられている、請求項1に記載の半導体装置。
- 前記第2基板は、
前記第1接続部分および前記トランジスタと電気的に接続された第1パッドと、
前記第2接続部分および前記キャパシタと電気的に接続された第2パッドと、
をさらに含む、請求項1に記載の半導体装置。 - 前記第1基板は、ガリウムおよびヒ素を含む第1半導体基板をさらに含み、
前記第2基板は、シリコンを含む第2半導体基板をさらに含む、
請求項1に記載の半導体装置。 - 前記第2電極内の電流は、平面視で前記第1方向に平行に流れる、請求項1に記載の半導体装置。
- 前記第2電極内の電流は、平面視で前記第1接続部分と前記第2接続部分とを結ぶ直線上を流れる、請求項10に記載の半導体装置。
- 前記配線内の電流は、平面視で前記第2方向に平行に流れる、請求項1に記載の半導体装置。
- 前記配線内の電流は、平面視で前記配線の側面に沿って流れる、請求項12に記載の半導体装置。
- 前記第1方向と前記第2方向との間の角度は、5度以下である、請求項1に記載の半導体装置。
- 前記キャパシタは、前記第1および第2接続部分よりも低い位置に設けられている、請求項1に記載の半導体装置。
- 前記第2基板は、半導体基板と、前記半導体基板上に設けられた絶縁膜と、前記絶縁膜内に設けられた第3および第4電極とをさらに含み、
前記キャパシタは、前記第3および第4電極を含む、請求項1に記載の半導体装置。 - 前記第2基板は、半導体基板をさらに含み、
前記キャパシタは、前記半導体基板上に設けられた実装部品である、請求項1に記載の半導体装置。 - 平面視において、前記第1接続部分と前記第2接続部分とを結ぶ直線と、前記配線の側面との間の距離は、前記第2電極の幅以下である、請求項1に記載の半導体装置。
- 平面視において、前記第1接続部分と前記第2接続部分とを結ぶ直線と、前記配線の側面との間の距離は、前記第1方向に垂直な第3方向における複数の前記半導体素子間のピッチ以下である、請求項1に記載の半導体装置。
- 光を発生させる発光素子を含み、前記発光素子からの光を被写体に照射する発光部と、
前記被写体から反射した光を受光する受光部と、
前記受光部により受光された光に基づいて、前記被写体との距離を測定する測距部とを備え、
前記発光部は、
半導体素子と、前記半導体素子に設けられた第1電極と、平面視で第1方向に延びる第2電極とを含む第1基板と、
平面視で前記第1方向と平行な第2方向に延びる配線と、前記配線と電気的に接続されたトランジスタと、前記配線と電気的に接続されたキャパシタとを含む第2基板と、
前記第1電極と前記第2基板とを電気的に接続する第1接続部分と、
前記第2電極と前記第2基板とを電気的に接続する第2接続部分と、
を備える、測距装置。
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WO2021005844A1 (ja) * | 2019-07-09 | 2021-01-14 | 株式会社村田製作所 | 光学装置、およびその製造方法 |
JP2021136306A (ja) * | 2020-02-26 | 2021-09-13 | 富士フイルムビジネスイノベーション株式会社 | 発光装置、光学装置及び情報処理装置 |
WO2022097390A1 (ja) * | 2020-11-06 | 2022-05-12 | ソニーセミコンダクタソリューションズ株式会社 | 半導体レーザ駆動装置、半導体レーザ駆動装置を備えたlidar及び半導体レーザ駆動装置を備えた車両 |
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