JP2013257491A - Camera module and range finder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent problems such as distortion and shape change generated in an imaging lens and peeling between members even when a temperature changes depending on use environment, and constitute highly accurate and stable retaining structure.SOLUTION: A range-finding camera module 1 comprises: a lens unit 3 including imaging lenses 2a and 2b imaging light from a subject; and solid-state imaging devices 4a and 4b disposed facing the imaging lenses 2a and 2b for capturing a subject's image formed by the imaging lenses 2a and 2b. Ribs 5a, 5b, and 5c for retaining a space from the solid-state imaging devices 4a and 4b are protrudingly formed on portions of the lens unit 3 that do not face the solid-state imaging devices 4a and 4b. The ribs 5a, 5b, and 5c are constituted of a material having a same linear expansion coefficient as that of the imaging lenses 2a and 2b.

Description

  The present invention relates to a camera module and a distance measuring device that can constitute a highly accurate and stable holding structure.

By using a compound eye optical system such as a lens unit in which a plurality of imaging lenses are integrally formed, a camera module for acquiring an image of a subject can be reduced in thickness and size.
In particular, by acquiring a plurality of images with parallax from a plurality of imaging lenses formed on the lens unit, the amount of parallax can be calculated from the parallax image, and the distance to the subject can be calculated based on the amount of parallax.

FIG. 7 is a schematic cross-sectional view showing a configuration of a conventional ranging camera module.
As a configuration of a ranging camera module using these compound-eye optical systems, as shown in FIG. 7, a two-dimensional sensor array 103 in which a plurality of imaging units 102a and 102b are formed and arranged on a silicon substrate 101 in a planar shape. A lens unit 105 in which a plurality of imaging lenses 104a and 104b are arranged and formed integrally, and a holding member 106 for holding an imaging distance from the imaging lenses 104a and 104b to the imaging units 102a and 102b. It is known that each imaging lens 104a, 104b and each imaging unit 102a, 102b are arranged to face each other in a one-to-one relationship.

However, in such a ranging camera module using a compound eye optical system, each member constituting the lens unit 105, the holding member 106, and the two-dimensional sensor array 103 is associated with a temperature change depending on the use environment. The member expands or contracts in accordance with the linear expansion coefficient of the member.
As a member constituting the lens unit 105, a resin material or a glass material is generally used. Their linear expansion coefficients are several tens ppm / ° C. or more for the resin material and about 10 ppm / ° C. for the glass material.
On the other hand, the imaging units 102a and 102b made of a solid-state imaging device are generally integrally formed on a silicon wafer by a semiconductor process, and the linear expansion coefficient of the solid-state imaging device is about 3 ppm / ° C. and relatively small.
Accordingly, each member expands or contracts with a temperature change depending on the use environment, so that an internal stress is generated due to a difference in expansion or contraction between the respective members, and distortion or distortion occurs in the imaging lens. There was a problem that shape change occurred. Further, in some cases, there is a possibility that peeling occurs at the joint portion between the members.

  In addition, since the amount of change between the distance between the imaging lenses forming the lens unit and the distance between the solid-state imaging elements forming the two-dimensional sensor array varies with the temperature change depending on the use environment, Even when the distance from the lens to the subject is the same, the amount of parallax obtained changes, and there is a problem that the distance to the subject cannot be accurately measured.

In Patent Document 1, a plurality of single lenses and a plurality of imaging regions are arranged so as to face each other in a one-to-one relationship, and the relative position between the single lens and the imaging region is prevented from shifting with respect to a surrounding temperature change. It is disclosed that it aims to do.
In addition, for the purpose of providing a camera module with stable ranging performance against changes in ambient temperature, a lens holder that holds a plurality of single lenses, and an imaging element holder that holds a plurality of imaging regions, There is disclosed a camera module characterized in that a lens holder and an image sensor holder are arranged to face each other, and the lens holder and the image sensor holder are composed of different members having substantially the same linear expansion coefficient of each material. .

However, in Patent Document 1, when the spacer positioned between the lens holder and the image sensor holder expands or contracts as the temperature changes, stress is generated between the members, and the lens is distorted or shaped. The problem that changes occur and in some cases peeling occurs at the joint between the members cannot be solved.
In addition, it is necessary to prepare a holder that has been subjected to drilling at the time of manufacturing the lens, and the number of manufacturing steps associated therewith increases, leading to an increase in cost.
Therefore, even when there is a temperature change depending on the usage environment, it is anxious to construct a highly accurate and stable holding structure by preventing problems such as distortion and shape change that occur in the imaging lens and peeling of the joint between the members. Has been.
The present invention was made in view of the above, and as its purpose, even when there is a temperature change depending on the use environment, problems such as distortion and shape change that occur in the imaging lens, separation between members, It is an object of the present invention to provide a camera module and a ranging camera module that can form a highly accurate and stable holding structure.

  In order to solve the above-mentioned problem, the invention according to claim 1 is for capturing a subject image formed by the imaging unit and a lens unit including at least one imaging lens that forms an image of light from the subject. In a camera module including a solid-state imaging device disposed opposite to the imaging lens, a rib portion for maintaining a distance from the solid-state imaging device protrudes from a portion of the lens unit that does not face the solid-state imaging device. The rib portion is made of a material having the same linear expansion coefficient as that of the imaging lens.

  Since it comprised as mentioned above, according to this invention, the rib part for maintaining the space | interval with a solid-state image sensor protrudes in the site | part of the lens unit which does not oppose a solid-state image sensor, and a rib part is an imaging lens. Because it is made of a material with the same linear expansion coefficient, even if there is a temperature change depending on the use environment, it prevents problems such as distortion and shape change that occur in the imaging lens, and peeling between members, and high An accurate and stable holding structure can be configured.

1 is a schematic cross-sectional view showing a configuration of a ranging camera module 1 according to a first embodiment of the present invention. It is the cross-sectional schematic which shows the structure of the ranging camera module 11 which is a modification of the ranging camera module 1 concerning 1st Embodiment of this invention. It is the cross-sectional schematic which shows the structure of the ranging camera module 15 which is a modification of the ranging camera module 1 concerning 1st Embodiment of this invention. It is the cross-sectional schematic of the ranging camera module 21 concerning 2nd Embodiment of this invention. (A) is the cross-sectional schematic which shows the structure of the ranging camera module 25 which is a modification of the ranging camera module 21 concerning 2nd Embodiment of this invention, (b) is the ranging camera module 31 of FIG. It is a section schematic diagram showing composition. It is a block diagram of the distance measuring device 31 concerning 3rd Embodiment of this invention. It is the cross-sectional schematic which shows the structure of the conventional ranging camera module.

An embodiment of the present invention will be described. According to the present embodiment, a lens unit that includes at least one imaging lens that forms an image of light from a subject, and a solid that is disposed to face the imaging lens in order to capture a subject image formed by the imaging lens. In a camera module having an image pickup device, a rib portion for maintaining a distance from the solid-state image pickup device protrudes from a portion of the lens unit that does not face the solid-state image pickup device, and the rib portion is the same line as the image pickup lens. It is characterized by being made of a material having an expansion coefficient.
Further, according to the present embodiment, the rib portion has a hollow portion or a recess, and a small line having a smaller linear expansion coefficient than the material constituting the imaging lens and the rib in the hollow portion or the recess. The expansion coefficient member is housed.

Embodiments of the present invention will be described below in detail with reference to the drawings.
<First Embodiment>
FIG. 1 is a schematic cross-sectional view showing a configuration of a ranging camera module 1 according to the first embodiment of the present invention.
The distance measuring camera module 1 is formed by integrating a pair of imaging lenses 2a and 2b, and forms a pair of imaging with a lens unit 3 that forms an image of light from a subject on each solid-state imaging device 4a and 4b. Each of the lenses 2a and 2b is opposed to each other in a one-to-one relationship, and is arranged with a predetermined interval. The solid-state imaging devices 4a and 4b are configured to capture an image of a subject formed on the imaging surface.
The part of the lens unit 3 that does not face the solid-state imaging devices 4a and 4b, that is, the part between the end 2ag0 and the outer edge 2ag1 of the imaging lens 2a, and from the outer edge 2ag2 of the imaging lens 2a to the outer edge 2bg1 of the imaging lens 2b. Between the outer edge 2bg2 and the end 2bg3 of the imaging lens 2b, such as the part between the outer edge 2bg2 and the end 2bg3, which is not opposed to the solid-state imaging devices 4a and 4b. Ribs 5a, 5b, 5c projecting from 2am2, 2bm1, 2bm2 in the direction of the solid-state imaging devices 4a, 4b (y direction) are integrally formed, and are formed on the end faces 5ah, 5bh, 5ch of the ribs 5a, 5b, 5c. The rib portions 5a, 5b, 5c are arranged so that the plurality of imaging elements 4a, 4b face the respective imaging lenses 2a, 2b formed in the lens unit 3 on a one-to-one basis. It is joined to the end surface. The rib portions 5a, 5b, and 5c are made of a material having the same linear expansion coefficient as that of the imaging lenses 2a and 2b.
1 to 6, the optical axis Y direction is the y axis, and the direction orthogonal to the optical axis is the x axis. 1 to 6 are provided with a pair of imaging lenses and solid-state imaging devices, respectively, three or more imaging lenses and solid-state imaging devices may be provided.

Here, as shown in FIG. 1, the imaging lenses 2 a and 2 b formed in the lens unit 3 are arranged at a distance of the distance L between the optical axes YY ′ designed to have a desired length. The rib portions 5a, 5b, and 5c formed integrally with the lens unit 3 are opposed to the imaging lenses 2a and 2b, respectively, when the solid-state imaging devices 4a and 4b are joined to the front end surfaces 5ah, 5bh, and 5ch. The distance D between the imaging lens 2a and the solid-state imaging device 4a and the distance D between the imaging lens 2b and the solid-state imaging device 4b are formed so as to be the focal length f of the imaging lenses 2a and 2b. ing.
Note that the parallax is Δ, the distance (base line length) between the optical axes YY ′ of the imaging lenses 2a and 2b is L, the distance between the imaging lenses 2a and 2b and the subject is H, and the focal length of the imaging lenses 2a and 2b is f. , H >> f, the following formula (1) is established.
H = L · f / Δ Expression (1)
Accordingly, since the base line length L and the focal length f are known, from the pixel output signals respectively output from the pixels in the respective imaging regions imaged by the solid-state imaging devices 4a and 4b by the distance measuring calculation unit (not shown). By calculating the parallax Δ by a known calculation method, the distance H between the imaging lenses 2a and 2b and the subject can be calculated.
A temperature sensor 6 is disposed at the center of the lens unit 3 provided in the ranging camera module 1 so that the environmental temperature of the lens unit 3 can be directly measured.

In the present embodiment, the separated solid-state imaging devices 4a and 4b are directly joined to the end surfaces 5ah, 5bh, and 5ch of the rib portions 5a, 5b, and 5c formed integrally with the lens unit 3, respectively. When the lens unit 3 expands in response to a change in ambient environmental temperature and the distance L between the optical axes YY ′ of the imaging lenses 2a and 2b formed on the lens unit 3 changes by ΔL, it is linked with the change amount ΔL. Similarly, the interval between the solid-state imaging devices 4a and 4b changes by the distance ΔL.
That is, the amount of movement for the interval between the imaging lenses 2a and 2b and the amount of movement for the interval between the solid-state imaging elements 4a and 4b in accordance with changes in the ambient environmental temperature are the same. The relative positional relationship between the imaging element 4a and the relative positional relationship between the imaging lens 2b and the solid-state imaging element 4b cannot deviate.

  The change amount ΔL of the distance between the optical axes YY ′ between the imaging lenses 2a and 2b (= the distance between the solid-state imaging devices 4a and 4b) L due to the change in the environmental temperature is the temperature change amount ΔT and the linear expansion coefficient of the lens material. It can be calculated from α, and is measured by changing the value of the baseline length L between the imaging lenses 2a and 2b in accordance with the temperature change ΔT detected by the temperature sensor 6 arranged in the ranging camera module 1. By performing the distance calculation process, highly accurate distance measurement is possible in a wide temperature range.

Here, the installation position of the temperature sensor 6 is not limited. However, as in the present embodiment, the temperature sensor 6 is disposed on the lens unit 3 so that the temperature T of the lens unit 3 can be directly measured. The amount of extension of the lens unit 3 corresponding to the temperature change can be calculated with high accuracy and reflected in the distance measurement calculation process.
Further, since the solid-state imaging devices 4a and 4b are separated from each other, the stress caused by the difference in expansion amount or the difference in contraction amount according to the temperature change of the lens unit 3 becomes extremely small. Therefore, it is possible to suppress the occurrence of distortion or shape change that occurs between the imaging lenses 2a and 2b. Moreover, the phenomenon that peeling between members arises depending on the case can also be suppressed.

The material of the lens unit 3 in the present embodiment is not limited to a resin material, and an optical member such as glass or plastic is appropriately selected. In this embodiment, even if the expansion or contraction in the optical axis Y direction and x direction generated in the material of the imaging lenses 2a and 2b is large, the distance measurement accuracy is not greatly affected. Can be used.
Further, since the ranging camera module 1 is composed of only the lens unit 3 and the solid-state imaging devices 4a and 4b, the number of components is small, and further, the number of joining steps associated therewith is small. 1 low cost can be realized.
As described above, rib portions 5a, 5b, and 5c for maintaining a space between the solid-state image pickup devices 4a and 4b are projected from the portions of the lens unit 3 that do not face the solid-state image pickup devices 4a and 4b. 5b and 5c are made of a material having the same linear expansion coefficient as that of the imaging lenses 2a and 2b. Even when there is a temperature change depending on the use environment, the optical axis Y direction of the imaging lens and x It is possible to prevent problems such as distortion and shape change in the direction and separation between members, and to configure a highly accurate and stable holding structure.

FIG. 2 is a schematic cross-sectional view showing a configuration of a distance measuring camera module 11 which is a modified example of the distance measuring camera module 1 according to the first embodiment of the present invention.
Regarding the structure of the rib portions 5a, 5b, and 5c formed integrally with the lens unit 3 in the present embodiment, as shown in FIG. 2, from the viewpoint of improving workability, each of the rib portions 5a, 5b, and 5c. It is desirable that the side surface portions 7a, 7b, 7c, and 7d have an inclination and have a draft angle during processing.
Further, from an optical viewpoint, in order to prevent unnecessary light from members other than the imaging lenses 2a and 2b from entering the solid-state imaging devices 4a and 4b, the side surface portions 7a, 7b and 7c of the rib portions 5a, 5b and 5c. , 7d are preferably subjected to processing such as blasting.
Furthermore, a light shielding layer may be formed on the side surface portions 7a, 7b, 7c, and 7d of the rib portions 5a, 5b, and 5c by means such as coating and film formation. Moreover, you may affix a light-shielding film on side part 7a, 7b, 7c, 7d.

FIG. 3 is a schematic cross-sectional view showing a configuration of a distance measuring camera module 15 which is a modified example of the distance measuring camera module 1 according to the first embodiment of the present invention.
As shown in FIG. 3, slit portions 8a, 8b, and 8c are provided in the rib portions 5a, 5b, and 5c provided in the lens unit 3, and light incident on the slit portions 8a, 8b, and 8c from the outside is provided. A light shielding member for shielding light may be embedded.

As described above, the ranging camera module 1 includes a lens unit including at least one imaging lens that forms an image of light from a subject, and the imaging lens for imaging a subject image formed by the imaging lens. Rib portions 5a, 5b, and 5c for maintaining a distance from the solid-state image pickup devices 4a and 4b at portions of the lens unit 3 that do not face the solid-state image pickup devices 4a and 4b. The ribs 5a, 5b and 5c are made of a material having the same linear expansion coefficient as that of the imaging lenses 2a and 2b.
Here, since the plurality of solid-state imaging devices 4a and 4b are separately joined to the integrated lens unit 3, the distance between the imaging lenses of the lens unit 3 fluctuates as the ambient temperature changes. In this case, since the solid-state imaging devices 4a and 4b also move in conjunction with the imaging lenses 2a and 2b, the relative positional relationship between the solid-state imaging devices 4a and 4b and the imaging lenses 2a and 2b does not change. Further, since the internal stress caused by the difference in expansion and contraction between the lens unit 3 and the solid-state imaging devices 4a and 4b due to the environmental temperature change can be reduced, the stress is generated even if the temperature changes due to the usage environment. Thus, it is possible to provide a small and inexpensive distance measuring camera module capable of preventing the occurrence of distortion of the lens shape and the separation between the constituent members, and at the same time capable of highly accurate distance measuring.

Second Embodiment
FIG. 4 is a schematic cross-sectional view of the ranging camera module 21 according to the second embodiment of the present invention.
As in the first embodiment, the distance measuring camera module 21 has a lens unit 3 formed by integrating a pair of imaging lenses 2a and 2b, and a pair of imaging lenses 2a and 2b. It is comprised from the solid-state image sensor 4a, 4b which opposes.
The lens unit 3 is integrally formed with rib portions 5a, 5b, and 5c protruding from the connection surface of the imaging lens 2 by a predetermined length D, and the tip surfaces 5ah, 5bh, and 5ch of the rib portions 5a, 5b, and 5c. A plurality of solid-state imaging devices 4a and 4b are joined to each imaging lens 2a and 2b formed in the lens unit 3 so as to face each other on a one-to-one basis.

Here, in the lens unit 3, a hollow portion 10a is formed between the rib portions 5b1 and 5b2 positioned between the imaging lenses 2a and 2b, and the hollow portion 10a is made of a material having a small linear expansion coefficient. The block portion 9a, which is a linear expansion coefficient member, is embedded and formed integrally. In addition, you may have a recess between rib part 5b1, 5b2 instead of the hollow part 10a.
The linear expansion coefficient α1 of the material of the block portion 9a is at least smaller than the linear expansion coefficient α2 of the material of the lens unit 3 (α1 <α2). For example, when the material of the lens unit 3 is plastic, the material of the block portion 9a is Metal, silicon, ceramic, glass and the like are applied, but a material having a linear expansion coefficient as small as possible is desirable.

According to the present embodiment, the block portion 9a is tightly accommodated in the hollow portion 10a provided between the rib portions 5b1 and 5b2 of the lens unit 3, and the rib portions 5b1 and 5b2 and the block portion 9a are integrally formed. Therefore, particularly in the region A shown in FIG. 4, the extension amount of the base line length L of the lens unit 3 accompanying the change in the ambient temperature is approximately the same as the extension amount of the block portion 9 having a small linear expansion coefficient.
Therefore, compared with the case where the rib portion 5b of the lens unit 3 shown in FIG. 2 referred to in the first embodiment is made of a material having the same linear expansion coefficient, in the second embodiment, the region A , The amount of elongation of the base line length L in the x direction with respect to the surrounding temperature change becomes small.

As a result, in the second embodiment, the distance calculation processing is performed by changing the value of the distance L between the optical axes YY ′ according to the output signal from the temperature sensor 6 arranged in the distance measuring camera module 21. Even in this case, if the extension amount of the distance L between the actual optical axes YY ′ with respect to the change in the ambient temperature is small as in the second embodiment, the change amount of the output signal at the temperature sensor 6 can also be reduced. A low-cost temperature sensor can be mounted as the temperature sensor 6.
Moreover, when using the temperature sensor which has a temperature characteristic comparable as the temperature sensor 6 used in 1st Embodiment, in 2nd Embodiment, the installation place of the temperature sensor 6 with respect to the lens unit 3 is a position shown in FIG. From the outer edge portion 2ag2 of the imaging lens 2a to the outer edge portion 2bg1 of the imaging lens 2b, the degree of freedom regarding the installation location of the temperature sensor 6 can be expanded.
Compared to the first embodiment, the stress generated between the lens unit 3 and the block 9a in the second embodiment due to the difference in linear expansion coefficient between the lens unit 3 and the block portion 9a due to the difference in linear expansion coefficient between the two. Since the stress generated in the region A between the imaging lenses 2a and 2b of the lens unit 3 is reduced, the shape and optical accuracy of the imaging lenses 2a and 2b are hardly affected.

FIG. 5A is a schematic cross-sectional view showing a configuration of a distance measuring camera module 25 which is a modification of the distance measuring camera module 21 according to the second embodiment of the present invention, and FIG. It is the cross-sectional schematic which shows the structure of the ranging camera module 31 which is a modification of the ranging camera module 21 concerning 2nd Embodiment of this.
In 2nd Embodiment, although the point comprised so that the lens unit 3 and the block part 9a might be integrated was demonstrated, this invention is not limited to such a case, The lens unit 3 was produced. Later, a block portion may be inserted into the hollow portion of the lens unit 3 and bonded and fixed. When the lens unit 3 is manufactured using a material that is inexpensive and has a high degree of freedom during shape processing, such as plastic, the lens unit 3 can be easily manufactured by forming the block portion integrally when the lens unit 3 is molded.

In this case, as shown in FIG. 5A, undercut processing is performed so that the side surface of the block portion 9b made of a metal material has a trapezoidal shape, and the block portion is integrally processed when the lens unit 3 is molded. By doing so, the lens unit can be firmly attached to the lens unit without bonding between the block unit and the lens unit 3.
Further, as shown in FIG. 5 (b), by processing the side surface and the upper surface of the block portion 9c made of a metal material into a concavo-convex shape, and forming the block portion integrally when the lens unit 3 is molded, Even if the block unit and the lens unit 3 are not bonded, they can be firmly adhered to the lens unit.
As a result, compared with the first embodiment, in this modification, the stress generated in the region A between the imaging lenses 2a and 2b of the lens unit 3 is reduced, so that the shape and optical accuracy of the imaging lenses 2a and 2b are reduced. Very little effect.

<Third Embodiment>
FIG. 6 is a block diagram of a distance measuring device 41 according to the third embodiment of the present invention.
The distance measuring camera module 1 shown in FIG. 6 is the same as that described in the first embodiment, but any one of the distance measuring camera modules 11, 15, 21, 25, and 31 shown in FIGS. May be.
In FIG. 6, the distance measuring camera module 1 includes an imaging lens 2a, 2b that forms an image of light from a subject, and an imaging lens for imaging a subject image formed by the imaging lenses 2a, 2b. The solid-state imaging devices 4a and 4b arranged opposite to each other and the temperature sensor 6 arranged between the lenses 2a and 2b are provided. The ranging calculation circuit 43 calculates the amount of parallax from the two image signals output from the solid-state imaging devices 4a and 4b, and calculates the distance to the subject based on the amount of parallax.

Here, the ranging calculation circuit 43 corrects the baseline length L when the distance L between the optical axes YY ′ of the imaging lenses 2a and 2b changes by ΔL based on the temperature signal from the temperature sensor 6, and The distance H between the imaging lenses 2a and 2b and the subject is calculated according to the equation (1).
In 3rd Embodiment, since the lens unit 3 demonstrated in 1st and 2nd embodiment is employ | adopted, since the stress which generate | occur | produces in the area | region A between imaging lens 2a, 2b becomes small, imaging lens 2a, 2b The shape and optical accuracy are hardly affected, and the base line length L between the optical axes YY ′ of the imaging lenses 2a and 2b is corrected based on the temperature signal from the temperature sensor 6 to obtain the imaging lenses 2a and 2b. Since the distance H between the subject and the subject is calculated, distance measurement with extremely high accuracy is possible, and a distance measuring device equipped with a small and inexpensive distance measuring camera module can be provided.

  DESCRIPTION OF SYMBOLS 1 ... Distance measuring camera module, 2 ... Imaging lens, 2a, 2b ... Imaging lens, 2a ... Imaging lens, 2b ... Imaging lens, 3 ... Lens unit, 4a ... Solid-state imaging device, 4a, 4b ... Solid-state imaging device, 4b ... Solid-state imaging device, 5a, 5b, 5c ... rib portion, 5ah, 5bh, 5ch ... tip surface, 5b ... rib portion, 5b1, 5b2 ... rib portion, 6 ... temperature sensor, 7a, 7b, 7c, 7d ... side surface portion, 8a, 8b, 8c ... slit part, 9 ... block part, 9a ... block part, 9b ... block part, 9c ... block part, 10a ... hollow part, 11 ... distance measuring camera module, 15 ... distance measuring camera module, 21 ... Distance camera module, 25 ... Distance camera module, 31 ... Distance camera module

WO2006 / 046396

Claims (6)

A lens unit that includes at least one imaging lens that forms an image of light from a subject, and a solid-state imaging device that is disposed to face the imaging lens in order to capture a subject image formed by the imaging lens. In the camera module
A rib portion for maintaining a distance from the solid-state image sensor protrudes from a portion of the lens unit that does not face the solid-state image sensor,
The said rib part is comprised with the material which has the same linear expansion coefficient as the said imaging lens, The camera module characterized by the above-mentioned.   The rib part has a hollow part or a recess, and a small linear expansion coefficient member having a linear expansion coefficient smaller than that of the material constituting the imaging lens and the rib part is accommodated in the hollow part or the recess. The camera module according to claim 1, wherein:   The camera module according to claim 1, wherein the lens unit is made of glass or plastic.   When the lens unit is made of plastic, the small linear expansion coefficient member is made of any one of metal, silicon, ceramic, and glass having a smaller linear expansion coefficient than the plastic. The camera module according to claim 2, wherein: The camera module according to any one of claims 1 to 4,
A ranging apparatus comprising: a ranging calculation circuit that calculates a distance to the subject by processing an electrical signal from at least one pair of the solid-state imaging devices. The camera module includes a temperature sensor that detects an environmental temperature,
6. The distance measuring device according to claim 5, wherein the distance measuring arithmetic circuit corrects a distance between the imaging lenses based on a temperature signal from the temperature sensor.

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