Optical device

Abstract

An optical device includes a pressing member for pressing an optical module having a head and a neck. The pressing member comprises: a first fixing portion fixed to the base near a first end of the base; a second fixing portion fixed to the base on a side opposite the first end relative to the head and opposite the second end relative to the neck; a first extension extending from the first fixing portion; a second extension extending from the second fixing portion; and a pressing portion provided on at least one of the first and second extensions and configured to press the head against the base in a direction opposite to a third direction. According to the present invention, an optical device having a novel structure is achieved, for example, with a more compact design and fewer defects.

Description

Technical Field

[0001] The present invention relates to optical devices. Background Art

[0002] Conventionally, an optical device in which an optical module and a substrate are mounted on a base is known (for example, Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2018-107445

[0006] Non-patent literature

[0007] Non-Patent Document 1: Atsushi Yamamoto, Takeo Okaniwa, Yoshitaka Yatomi, and Masayoshi Nishida, "Development of a Small ITLA for Optical Digital Coherent Communications," Furukawa Electric Times, No. 134 (January 2015), pp. 2-6 Summary of the Invention

[0008] Problems to be solved by the invention

[0009] In such optical devices, it would be beneficial if an optical device with a novel structure that can, for example, be configured more compactly and have fewer defects could be obtained.

[0010] Therefore, one of the objects of the present invention is to obtain an optical device having a novel structure with fewer defects, for example, which can be configured more compactly.

[0011] Solutions to Problems

[0012] An optical device according to the present invention includes, for example, a base having a first end in a first direction and a second end extending in the first direction as an end in a second direction intersecting the first direction; an optical module having a head and a neck, the head adjacent to the base in a third direction intersecting the first and second directions and located near the second end with a longitudinal direction of the head along the first direction, the neck protruding from the head in a direction opposite to the first direction and being thinner than the head; a substrate aligned with the head in the second direction and mounted on the base; and a pressing member having a first fixing portion, a second fixing portion, a first extending portion, a second extending portion, and a pressing portion, the first fixing portion being fixed to the base near the first end, the second fixing portion being fixed to the base on a side of the head opposite to the first end and on a side of the neck opposite to the second end, the first extending portion extending from the first fixing portion, and the second extending portion extending from the second fixing portion, the pressing portion being provided on at least one of the first extending portion and the second extending portion and pressing the head against the base in a direction opposite to the third direction.

[0013] In addition, in the optical device, for example, the first extension portion has a first portion and a second portion, the first portion is located on the side opposite to the base relative to the head in the third direction, and the second portion extends between the first portion and the first fixed portion, and when observed along the third direction, the first fixed portion and the second portion are arranged along the first direction.

[0014] Furthermore, the optical device includes a mounted portion located at a position offset from the first fixing portion in the second direction or in a direction opposite to the second direction, and to which a fixing member for fixing the base to another member is mounted.

[0015] In addition, in the optical device, for example, the second extension portion has a third portion and a fourth portion, the third portion is located on the side opposite to the base relative to the head in the third direction, and the fourth portion extends between the third portion and the second fixed portion, and when observed along the third direction, the fourth portion is located at a position offset toward the second direction relative to the second fixed portion.

[0016] Furthermore, in the optical device, for example, a portion of the fourth portion is located on the opposite side of the second end portion relative to the neck portion.

[0017] Furthermore, in the optical device, for example, the fourth portion is partially located between the neck and the base, and partially located closer to the second end portion than the neck.

[0018] Furthermore, in the optical device, for example, the second fixing portion is located at a position overlapping with the head portion when viewed in the first direction.

[0019] Furthermore, in the optical device, for example, at least one of the first fixing portion and the second fixing portion is attached to the base via a fixing member, and the substrate is attached to the base via the fixing member.

[0020] Furthermore, in the optical device, for example, the substrate is located between the base and at least one of the first fixing portion and the second fixing portion.

[0021] Furthermore, in the optical device, for example, at least one of the first fixing portion and the second fixing portion is located between the substrate and the base.

[0022] In addition, in the optical device, for example, the first extension portion and the second extension portion are integrally connected.

[0023] In addition, in the optical device, for example, the first extending portion and the second extending portion are separated from each other.

[0024] Furthermore, in the optical device, for example, the first extending portion has portions having different widths in the second direction.

[0025] Furthermore, in the optical device, for example, the second extending portion has portions having different widths in the second direction.

[0026] Furthermore, in the optical device, at least one of the first extending portion and the second extending portion has a protruding portion that protrudes in the second direction or in a direction opposite to the second direction.

[0027] Furthermore, in the optical device, for example, the optical module includes a semiconductor laser.

[0028] Furthermore, in the optical device, for example, the optical module includes a wavelength-variable laser.

[0029] Effects of the Invention

[0030] According to the present invention, it is possible to obtain an optical device having a novel structure with fewer defects, for example, a more compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1It is an illustrative and schematic perspective view of the optical device according to the first embodiment.

[0032] Figure 2 is an illustrative and schematic perspective view of the optical device of the first embodiment, and is taken along Figure 1 The diagram when viewed from different directions.

[0033] Figure 3 It is an illustrative and schematic top view of the optical device of the first embodiment.

[0034] Figure 4 yes Figure 1 An enlarged view of a portion of .

[0035] Figure 5 is an illustrative and schematic side view of the optical device of the first embodiment.

[0036] Figure 6 is an illustrative and schematic side view of the optical device of the first embodiment, and is Figure 5 The diagram when viewed from different directions.

[0037] Figure 7 It is an illustrative and schematic top view of the optical device of the second embodiment.

[0038] Figure 8 It is an illustrative and schematic perspective view of an optical device according to a second embodiment.

[0039] Figure 9 It is an illustrative and schematic perspective view of an optical device according to a third embodiment.

[0040] Figure 10 is an illustrative and schematic side view of an optical device according to a first modification.

[0041] Figure 11 It is an illustrative and schematic top view of an optical device according to a second modification.

[0042] Figure 12 It is an illustrative and schematic top view of an optical device according to a third modification.

[0043] Figure 13 It is an illustrative and schematic top view of an optical device according to a fourth modification.

[0044] Description of reference numerals:

[0045] 1A to 1G…Optical device; 10…Base; 11…Bottom surface; 12…Top surface; 12a…Recessed portion; 13a…Side surface (first end portion); 13b…Side surface (second end portion); 13c, 13d…Side surface; 14…Step surface; 15a…Opening; 15b…Peripheral portion (mounted portion); 20…Optical module; 20a…Wavelength variable semiconductor laser element; 21…Head portion; 21a…Bottom surface; 21b…Top surface; 21c1, 21c2…End surface; 21… d1, 21d2…side surface; 22…neck; 22a…outer peripheral surface; 22b…end portion; 23…optical fiber; 24…lead terminal; 25…conductor; 30…circuit board (substrate); 30a…surface; 30b…surface; 30c1–30c4…end portions; 30d…cutout (opening); 30e…conductor; 30f…insulator; 31…component; 31a…electrical connector; 40A, 40B, 40E, 40F, 40G…pressing member; 40E1, 40E2…member; 41…first fixing portion; 42…second fixing portion; 43…intermediate portion; 43a…protruding portion; 43a1, 43a2…widening portion; 431…extension portion (first extension portion); 431a1, 431a2…bend portion (second portion); 431b1…flat portion (second portion); 431b2…flat portion (first portion; pressing portion); 431d1, 431d2…portions (of different widths); 432…extension portion (first portion); two extension parts); 432a1, 432a2…bent part (fourth part); 432b1…flat part (fourth part); 432b2…flat part (third part; pressing part); 432c…fourth part; 432c1, 432c2…part; 432d1, 432d2…part (different widths); 44…elastic member; 51…fixing member; 51a…head; 52…fixing member; 52a…head; 53…fixing member (fixing member). DETAILED DESCRIPTION

[0046] The following discloses exemplary embodiments and variations of the present invention. The structures of the embodiments and variations shown below, as well as the functions and results (effects) brought about by the structures, are merely examples. The present invention can also be implemented using structures other than those disclosed in the following embodiments and variations. In addition, according to the present invention, at least one of the various effects (including derived effects) obtained by the structure can be obtained.

[0047] The embodiment and the modified example shown below possess the same structure. Therefore, according to the structure of each embodiment and the modified example, the same action and effect based on this same structure can be obtained. In addition, in the following description, these same structures are sometimes denoted by the same reference numerals, and repeated description is omitted.

[0048] In this specification, ordinal numbers are used for the purpose of distinguishing components, parts, etc., and do not indicate priority or order.

[0049] In each figure, the X direction is indicated by an arrow X, the Y direction is indicated by an arrow Y, and the Z direction is indicated by an arrow Z. The X direction, the Y direction, and the Z direction intersect and are orthogonal to each other. It should be noted that the X direction may be referred to as the length direction, the Y direction may be referred to as the width direction, and the Z direction may be referred to as the thickness direction, the height direction, or the normal direction of the substrate surface.

[0050] [First embodiment]

[0051] Figure 1 1A is a perspective view of an optical device according to the present embodiment. The optical device 1A includes a base 10 , an optical module 20 , a circuit board 30 , and a pressing member 40A.

[0052] The base 10 functions as a supporting member for the optical module 20 and the circuit board 30. The base 10 is made of a metal material with high thermal conductivity, such as aluminum alloy, and functions as a heat dissipating member for dissipating heat generated in various parts, particularly the optical module 20.

[0053] like Figure 1 、 2 As shown, the base 10 has a rectangular plate-like shape extending so as to intersect and be perpendicular to the Z direction. The base 10 has a bottom surface 11 , a top surface 12 , side surfaces 13 a to 13 d , and a stepped surface 14 .

[0054] The bottom surface 11 faces the direction opposite to the Z direction and extends to intersect and be perpendicular to the Z direction.

[0055] The top surface 12 faces the Z direction and extends to intersect and be perpendicular to the Z direction. The top surface 12 is substantially parallel to the bottom surface 11 .

[0056] like Figure 1 As shown, side surface 13a is an end portion in the X direction. Side surface 13a extends in the X direction, intersecting and orthogonal to the X direction. In other words, side surface 13a extends generally along the Y direction and the Z direction. Furthermore, side surface 13a extends long in the Y direction. Side surface 13a is an example of a first end portion. It should be noted that side surface 13a may also be referred to as an end surface.

[0057] like Figure 2As shown, side surface 13b is an end portion in the Y direction. Side surface 13b extends in the Y direction, intersecting and orthogonal to the Y direction. In other words, side surface 13b extends generally along the X and Z directions. Furthermore, side surface 13b extends long in the X direction. Side surface 13b is an example of a second end portion. It should be noted that side surface 13b may also be referred to as an end surface.

[0058] Side surface 13c is the end portion facing in the direction opposite to the X-direction. Side surface 13c extends in the direction opposite to the X-direction, intersecting and orthogonal to the X-direction. In other words, side surface 13c extends generally along the Y-direction and the Z-direction. Side surface 13c extends long in the Y-direction. Furthermore, side surface 13c is generally parallel to side surface 13a. It should be noted that side surface 13c may also be referred to as an end surface.

[0059] like Figure 1 As shown, side surface 13d is the end portion in the direction opposite to the Y direction. Side surface 13d extends in the direction opposite to the Y direction, intersecting and orthogonal to the Y direction. In other words, side surface 13d extends generally along the X and Z directions. Side surface 13d extends long in the X direction. Furthermore, side surface 13d is generally parallel to side surface 13b. It should be noted that side surface 13d may also be referred to as an end surface.

[0060] like Figure 2 As shown, the step surface 14 is located between the bottom surface 11 and the top surface 12 in the Z direction and is offset from the top surface 12 in the opposite direction of the Z direction. The step surface 14 is oriented in the Z direction and extends in a manner that intersects and is orthogonal to the Z direction. In other words, the step surface 14 extends approximately along the X direction and the Y direction. The step surface 14 extends longer in the X direction. In addition, the step surface 14 is approximately parallel to the top surface 12. The step surface 14 can also be referred to as the bottom surface of the cutout or recess provided at the end portions (corners) of the base 10 in the Z direction and the Y direction.

[0061] like Figure 1 As shown, a recessed portion 12a that is recessed in the direction opposite to the Z direction is provided on the top surface 12. A component 31 mounted on the surface 30a of the circuit board 30 is accommodated in the recessed portion 12a.

[0062] like Figure 1 、 2 As shown, the optical module 20 includes a head 21 , a neck 22 , an optical fiber 23 , and a lead terminal 24 .

[0063] The head 21 has a flat rectangular parallelepiped shape that is long in the X direction and slightly shorter in thickness in the Z direction than in width in the Y direction. The head 21 is attached to the base 10 with its longitudinal direction along the X direction.

[0064] like Figure 2As shown, the head 21 and a portion of the neck 22 are adjacent to the step surface 14 of the base 10 in the Z direction. The head 21 is placed on the step surface 14 in contact with the step surface 14. Specifically, the bottom surface 21a of the head 21 is substantially in close contact with the step surface 14.

[0065] It should be noted that a heat sink may be interposed between the bottom surface 21a and the stepped surface 14. The interposition of the heat sink facilitates the transfer of heat generated by the head 21 to the base 10. In this case, the heat sink can be made of, for example, a synthetic resin material or graphite with good heat dissipation properties. It can be a thin sheet-like member (heat sink) or a thick pad-like member (heat dissipation pad). Alternatively, the heat sink can be a material such as a heat dissipation grease.

[0066] In addition, the side surface 21 d 1 of the head portion 21 is located close to the side surface 13 b of the base 10 .

[0067] The optical module 20 is, for example, a wavelength-variable semiconductor laser module having a wavelength-variable semiconductor laser element 20a built into the head 21, in other words, within the housing of the head 21. However, the optical module 20 is not limited to this configuration and may include optical elements such as a light-receiving element, a modulator, or a semiconductor optical amplifier. The wavelength-variable semiconductor laser element 20a is an example of a semiconductor laser and also an example of a wavelength-variable laser.

[0068] The optical module 20 outputs laser light of the desired wavelength and power from the optical fiber 23. The optical module 20 has a structure that integrates a wavelength-variable semiconductor laser element, an optical combiner, and a semiconductor optical amplifier, as disclosed in Non-Patent Document 1. Furthermore, the optical module 20 includes a known wavelength locking mechanism using a filter to control the wavelength of the wavelength-variable semiconductor laser element. Furthermore, the optical module 20 includes a temperature adjustment element and a temperature monitoring element for respectively regulating the temperature of the wavelength-variable semiconductor laser element and the filter.

[0069] like Figure 1 、 2 As shown, the head portion 21 has a bottom surface 21 a , a top surface 21 b , end surfaces 21 c 1 , 21 c 2 , and side surfaces 21 d 1 , 21 d 2 .

[0070] like Figure 2 As shown, the bottom surface 21 a faces the direction opposite to the Z direction and extends so as to intersect and be orthogonal to the Z direction.

[0071] The top surface 21b faces the Z direction and extends so as to intersect and be perpendicular to the Z direction. In addition, the top surface 21b and the bottom surface 21a are substantially parallel.

[0072] like Figure 1As shown, end surface 21c1 is the end in the X direction. End surface 21c1 faces the X direction and extends perpendicularly to and intersects the X direction. In other words, end surface 21c1 extends generally along the Y direction and the Z direction. Furthermore, end surface 21c1 has a rectangular (quadrilateral) shape that is longer in the Y direction.

[0073] like Figure 2 As shown, end surface 21c2 is the end facing the opposite direction of the X-direction. End surface 21c2 faces the opposite direction of the X-direction, extending in a manner that intersects and is perpendicular to the X-direction. In other words, end surface 21c2 extends generally along the Y-direction and the Z-direction. End surface 21c2 has a rectangular shape (quadrilateral shape) that is longer in the Y-direction. Furthermore, end surface 21c2 is generally parallel to end surface 21c1.

[0074] Side surface 21d1 is an end portion in the Y direction. Side surface 21d1 extends in the Y direction, intersecting and orthogonal to the Y direction. In other words, side surface 21d1 extends generally along the X and Z directions. Furthermore, side surface 21d1 has a rectangular (quadrilateral) shape that is longer in the X direction. It should be noted that side surface 21d1 may also be referred to as an end surface.

[0075] like Figure 1 As shown, side surface 21d2 is the end portion in the opposite direction to the Y direction. Side surface 21d2 extends in the opposite direction to the Y direction, intersecting and orthogonal to the Y direction. In other words, side surface 21d2 extends generally along the X direction and the Z direction. Side surface 21d2 has a rectangular shape (quadrilateral shape) that is longer in the X direction. In addition, side surface 21d2 is generally parallel to side surface 21d1. It should be noted that side surface 21d2 can also be referred to as an end surface.

[0076] like Figure 2 As shown, the neck portion 22 protrudes from the approximate center of the end surface 21c2 of the head portion 21 in the direction opposite to the X direction. The neck portion 22 has a stepped cylindrical shape. The diameter of the neck portion 22 is smaller than the thickness (height) of the head portion 21 in the Z direction. In other words, the neck portion 22 is thinner than the head portion 21. In addition, the diameter of the neck portion 22 decreases as it moves away from the end surface 21c2. The outer peripheral surface 22a of each portion of the neck portion 22 is a cylindrical surface or a conical surface. However, the shape of the neck portion 22 is not limited to this.

[0077] The optical fiber 23 extends from the front end of the neck portion 22 , in other words, from the end portion 22 b in the opposite direction to the X direction, in the opposite direction to the X direction.

[0078] In this embodiment, as an example, the lead terminals 24 are integrated with the optical module 20. However, this is not limiting, and as another example, the lead terminals 24 may be mounted between the optical module 20 and the circuit board 30 when the optical device 1A is assembled. The plurality of lead terminals 24 are arranged in the X direction at predetermined intervals (e.g., equal intervals).

[0079] The lead terminals 24 are conductors that allow signals and power to be transmitted and received between the optical module 20 and the circuit board 30. The lead terminals 24 have, for example, a curved, elongated plate or columnar shape and are made of a conductive metal material such as copper or aluminum. The lead terminals 24 can be manufactured by conventional machining processes such as stamping, bending, and cutting.

[0080] like Figure 1 As shown, the lead terminals 24 electrically connect the conductors 25 exposed on the side surface 21 d 2 of the head 21 to the conductors 30 e provided on the circuit board 30 .

[0081] The circuit board 30 is adjacent to the base 10 in the Z direction and is aligned with a portion of the head 21 and the neck 22 of the optical module 20 in the Y direction. The circuit board 30 is an example of a substrate.

[0082] Components 31 such as electronic components and electrical components are mounted on the circuit substrate 30. The control circuit of the optical module 20 is formed by the conductors of the circuit substrate 30 and the components 31. The control circuit supplies a driving current to the optical module 20 based on various monitoring signals output from the optical module 20 to control the operation of the optical module 20. The control circuit includes, for example, a digital operation device, a memory, a current control circuit, a temperature monitoring circuit, an optical power monitoring circuit, a wavelength monitoring circuit, etc. The control circuit is electrically connected to a host device (not shown) via an electrical connector 31a. Electrical signals are sent and received between the control circuit and the host device via the electrical connector 31a, and the optical device 1A receives power from the host device via the electrical connector 31a. The circuit substrate 30 is an example of a substrate. It should be noted that the component 31 includes the electrical connector 31a.

[0083] The circuit substrate 30 includes an insulator 30f and a conductor. The circuit substrate 30 includes a conductor (not shown) within the circuit substrate 30 and a conductor 30e exposed outside the circuit substrate 30. In this embodiment, the circuit substrate 30 is, as an example, a rigid substrate and a multilayer substrate. However, this is not limiting and the circuit substrate 30 may also be a single-sided substrate, a double-sided substrate, or a flexible substrate.

[0084] The circuit board 30 is developed so as to intersect and be perpendicular to the Z direction. The circuit board 30 has a quadrilateral and plate-like shape.

[0085] The circuit board 30 has a surface 30a, which forms an end in the direction opposite to the Z direction, and a surface 30b, which forms an end in the Z direction. Surface 30a faces in the direction opposite to the Z direction, intersecting and being perpendicular to the Z direction. Surface 30b faces in the Z direction, intersecting and being perpendicular to the Z direction. Surfaces 30a and 30b are generally parallel. Surface 30a may also be referred to as the back surface, and surface 30b may also be referred to as the front surface. The Z direction may also be referred to as the thickness direction of the circuit board 30.

[0086] like Figure 1 As shown, the circuit board 30 has ends 30c1 and 30c4. The end 30c1 is an end in the X direction and extends substantially along the Y direction. The end 30c4 is an end in the opposite direction to the Y direction and extends substantially along the X direction.

[0087] like Figure 2 As shown, the circuit board 30 has ends 30c2 and 30c3. End 30c2 is an end in the Y direction and extends generally along the X direction. End 30c3 is an end in the direction opposite to the X direction and extends generally along the Y direction. End 30c2 is generally parallel to end 30c4, and end 30c3 is generally parallel to end 30c1.

[0088] The circuit substrate 30 is mounted on the base 10 in a state where it is placed on the top surface 12 of the base 10. The circuit substrate 30 is mounted on the base 10 via a fixing member 51. In this embodiment, as an example, an internal threaded hole (not shown) opening in the Z direction is provided in the base 10, and the fixing member 51 is a screw or bolt having an external thread (not shown) and a head 51a that engages with the internal threaded hole. In addition, a notch 30d is provided in the circuit substrate 30 as an opening for the fixing member 51 to pass through. In a state where the head 51a and the peripheral portion of the notch 30d overlap in the Z direction, the fixing member 51 is mounted on the base 10 in a manner such that the external thread engages with the internal threaded hole, so that the head 51a presses the peripheral portion of the notch 30d toward the base 10 in the opposite direction of the Z direction, thereby mounting the circuit substrate 30 on the base 10. It should be noted that in the case where the base 10 has an external threaded member such as a stud bolt, the fixing member 51 may also be a nut having an internal thread. In addition, a through hole may be provided as an opening instead of the cutout 30d in the circuit board 30. In addition, the fixing member may be a member other than a screw or a bolt, such as a rivet.

[0089] The pressing member 40A is attached to the base 10 and presses the head 21 of the optical module 20 against the base 10 in the direction opposite to the Z direction. The pressing member 40A has a bent plate shape, for example, and can be made of a metal material such as stainless steel. Furthermore, the pressing member 40A can be manufactured by conventional machining processes such as stamping, bending, and cutting.

[0090] Figure 3 is a top view of the optical device 1A, Figure 4 yes Figure 1 An enlarged view of a portion of the Figure 3 、 4 As shown, the pressing member 40A includes a first fixing portion 41 , a second fixing portion 42 , and an intermediate portion 43 . The intermediate portion 43 connects the first fixing portion 41 and the second fixing portion 42 .

[0091] The first fixing portion 41 is located near the side surface 13a. In other words, the first fixing portion 41 is adjacent to the side surface 13a in the opposite direction of the X direction (length direction). The first fixing portion 41 is mounted on the base 10 via a fixing member 52. In this embodiment, as an example, an internal threaded hole (not shown) opening in the Z direction is provided on the base 10, and the fixing member 52 is a screw or bolt having an external thread (not shown) engaged with the internal threaded hole and a head 52a. In addition, a through hole (not shown) is provided on the first fixing portion 41 as an opening for the external thread of the fixing member 52 to pass through. In a state where the head 52a overlaps with the peripheral portion of the through hole in the Z direction, the fixing member 52 is mounted on the base 10 in such a manner that the external thread is engaged with the internal threaded hole, so that the head 52a presses the peripheral portion of the through hole in the opposite direction of the Z direction toward the base 10, thereby mounting the first fixing portion 41 on the base 10. It should be noted that if the base 10 has an externally threaded member such as a stud bolt, the fixing member 52 may also be a nut having an internal thread. Furthermore, a notch may be provided in the first fixing portion 41 as an opening in place of the through hole. Furthermore, the fixing member may be a member other than a screw or bolt, such as a rivet.

[0092] The second fixing portion 42 is located on the side opposite to the side 13a of the head portion 21 and on the side opposite to the side 13b of the base 10 of the neck portion 22. The second fixing portion 42 is also attached to the base 10 via a fixing member 52. The second fixing portion 42 has the same structure as the first fixing portion 41 and is attached to the base 10 via a fixing member 52, similarly to the first fixing portion 41.

[0093] The intermediate portion 43 includes an extension portion 431 extending from the first fixing portion 41 and an extension portion 432 extending from the second fixing portion 42. In this embodiment, the extension portion 431 and the extension portion 432 are integrally connected. The extension portion 431 is an example of a first extension portion, and the extension portion 432 is an example of a second extension portion. In this embodiment, for convenience, the portion of the intermediate portion 43 from the first fixing portion 41 to the center of the intermediate portion 43 in the X direction is referred to as the extension portion 431, and the portion of the intermediate portion 43 from the second fixing portion 42 to the center of the intermediate portion 43 in the X direction is referred to as the extension portion 432.

[0094] The extension portion 431 includes a bent portion 431 a 1 , a flat portion 431 b 1 , a bent portion 431 a 2 , and a flat portion 431 b 2 .

[0095] The bent portion 431a1 is adjacent to the first fixing portion 41 in the direction opposite to the X direction. In the bent portion 431a1, the extending portion 431 is bent so as to go toward the Z direction as it moves away from the first fixing portion 41.

[0096] The flat portion 431b1 is adjacent to the curved portion 431a1 in the Z direction. In the flat portion 431b1, the extension portion 431 extends in the Z direction as it moves away from the first fixing portion 41. The flat portion 431b1 is located near the end surface 21c1 of the head portion 21 but slightly separated from the end surface 21c1 in the X direction. In other words, the flat portion 431b1 extends in the Z direction along the end surface 21c1.

[0097] The curved portion 431a2 is adjacent to the flat portion 431b1 in the Z direction. At the curved portion 431a2, the extension portion 431 is curved so as to move away from the first fixing portion 41 in a direction opposite to the X direction. The curved portion 431a2 is curved so as to bypass the corner between the end surface 21c1 and the top surface 21b of the head portion 21.

[0098] The flat portion 431b2 is adjacent to the curved portion 431a2 in the direction opposite to the X-direction. In the flat portion 431b2, the extension portion 431 extends in the direction opposite to the X-direction as it moves away from the first fixing portion 41. The flat portion 431b2 extends in the direction opposite to the X-direction along the top surface 21b of the head portion 21. In this embodiment, a gap exists between the flat portion 431b2 and the top surface 21b, but this gap may not be present.

[0099] The extension portion 431 has a substantially constant width in the Y direction from the first fixing portion 41 to the curved portion 431a1, the flat portion 431b1, and the curved portion 431a2. In contrast, the width of the extension portion 431 in the Y direction changes as it moves away from the first fixing portion 41 in the flat portion 431b2.

[0100] In the extension portion 431, the flat portion 431b2 is located on the side opposite to the base 10 relative to the head 21. In addition, the curved portion 431a1, the flat portion 431b1, and the curved portion 431a2 extend between the flat portion 431b2 and the first fixing portion 41. Figure 3As shown, when viewed in the direction opposite to the Z direction (i.e., the same applies when viewed in the Z direction), the first fixing portion 41, the curved portion 431a1, the flat portion 431b1, and the curved portion 431a2 are arranged along the X direction. The flat portion 431b2 is an example of a first portion, and the curved portion 431a1, the flat portion 431b1, and the curved portion 431a2 are examples of a second portion. It should be noted that the second portion is not limited to this configuration, as long as it extends between the first portion and the first fixing portion 41.

[0101] In addition, if Figure 3 As shown, the base 10 is provided with an opening 15a for fixing the base 10 to another component. The opening 15a is, for example, a through hole extending in the Z direction and passing through the bottom surface 11 and the top surface 12. However, the opening 15a is not limited to this and may also be a notch, for example.

[0102] The base 10 is mounted on other components (not shown) via a fixing member (not shown). In this embodiment, as an example, an internal threaded hole (not shown) opening in the Z direction is provided in the other component, and the fixing member is a screw or bolt having an external thread and a head that engages with the internal threaded hole. In a state where the head of the fixing member overlaps with the peripheral portion 15b of the opening 15a in the Z direction, the fixing member is mounted on the other component in such a manner that the external thread engages with the internal threaded hole, so that the head of the fixing member presses the peripheral portion 15b of the opening 15a in the opposite direction of the Z direction toward the other component, thereby mounting the base 10 on the other component. It should be noted that, in the case where the other component has an external threaded member such as a stud bolt, the fixing member may also be a nut with an internal thread. In addition, a cutout may be provided in the base 10 instead of the opening 15a as a through hole. In addition, the fixing member may also be a member different from a screw or bolt, such as a rivet.

[0103] In such Figure 3 As shown, when viewed in the opposite direction of the Z direction (i.e., the same applies when viewed in the Z direction), the opening 15a and the peripheral portion 15b are located at a position offset in the opposite direction of the Y direction relative to the first fixing portion 41 and adjacent to the first fixing portion 41. The peripheral portion 15b is an example of a mounted portion, and the fixing piece in this case is an example of a fixing member.

[0104] On the other hand, Figure 3 、 4 As shown, the extension portion 432 has a bent portion 432a1, a bent portion 432a2, a flat portion 432b1, and a flat portion 432b2.

[0105] The bent portion 432a1 is adjacent to the second fixing portion 42 in the Y direction. In the bent portion 432a1, the extending portion 432 is bent so as to move away from the second fixing portion 42 toward the Z direction.

[0106] The curved portion 432a2 is adjacent to the curved portion 432a1 in the Y and Z directions. In the curved portion 432a2, the extension portion 432 is curved so as to move away from the second fixing portion 42 toward the Y direction. The curved portion 432a1 and the curved portion 432a2 form an S-shaped curved portion.

[0107] The flat portion 432b1 is adjacent to the curved portion 432a2 in the Y direction. In the flat portion 432b1, the extension portion 432 extends in the X direction as it moves away from the second fixing portion 42. Figure 3 As shown in FIG. 1 , when viewed in the opposite direction of the Z direction (ie, the same is true when viewed in the Z direction), the extension portion 432 is bent in an L-shape between the curved portion 432a2 and the flat portion 432b1. Figure 3 As shown, when viewed in the direction opposite to the Z direction (that is, the same also applies when viewed in the Z direction), the flat portion 432b1 is a portion offset from the head portion 21 in the direction opposite to the X direction.

[0108] The flat portion 432b2 is adjacent to the flat portion 432b1 in the X direction. In the flat portion 432b2, the extension portion 432 extends in a manner that tends to the X direction as it moves away from the second fixing portion 42. Figure 3 As shown, when viewed in the direction opposite to the Z direction (i.e., the same applies when viewed in the Z direction), the flat portion 432b2 is a portion that overlaps with the head portion 21. The flat portion 432b2 extends in the X direction along the top surface 21b of the head portion 21. In this embodiment, a gap exists between the flat portion 432b2 and the top surface 21b, but this gap does not necessarily have to exist.

[0109] The extension portion 432 has a substantially constant width in the X direction from the second fixing portion 42 to the curved portions 432a1 and 432a2 . In contrast, the width of the extension portion 432 in the Y direction changes as it moves away from the second fixing portion 42 in the flat portions 432b1 and 432b2 .

[0110] In the extension portion 432, the flat portion 432b2 is located on the side opposite to the base 10 relative to the head 21. In addition, the curved portion 432a1, the curved portion 432a2 and the flat portion 432b1 extend between the flat portion 432b2 and the second fixing portion 42. Figure 3As shown, when viewed in the direction opposite to the Z direction (i.e., the same applies when viewed in the Z direction), the curved portion 432a1, the curved portion 432a2, and the flat portion 432b1 are offset in the Y direction relative to the second fixing portion 42. The flat portion 432b2 is an example of a third portion, and the curved portion 432a1, the curved portion 432a2, and the flat portion 432b1 are an example of a fourth portion. It should be noted that the fourth portion is not limited to this configuration, as long as it extends between the third portion and the second fixing portion 42.

[0111] Figure 5 : is a side view of the optical device 1A when viewed in the Y direction. Figure 5 As shown, elastic members 44 are interposed between the flat portion 431b2 and the top surface 21b of the head portion 21, and between the flat portion 432b2 and the top surface 21b, respectively. The flat portions 431b2 and 432b2, i.e., the intermediate portion 43, press the top surface 21b, i.e., the head portion 21, in the opposite Z direction via the elastic members 44. The flat portions 431b2 and 432b2 are examples of pressing portions. The elastic members 44 may also be referred to as intervening members or intervening objects. The elastic members 44 are preferably flexible and are in an elastically compressed state when installed.

[0112] Figure 6 : is a side view of the optical device 1A when viewed in the X direction. Figure 6 As shown, the second fixing portion 42 is located so as to partially overlap the head portion 21 when viewed in the X direction. Furthermore, the curved portions 432a1 and 432a2 are located on the side of the neck portion 22 opposite the side surface 13b of the base 10 in the Y direction. Furthermore, the curved portion 432a2 curves at intervals along the substantially cylindrical outer circumferential surface 22a of the neck portion 22. Furthermore, when viewed in the X direction, portions of the curved portions 432a1 and 432a2 are located between the side surface 21d2 of the head portion 21 and the outer circumferential surface 22a of the neck portion 22, and partially overlap the head portion 21.

[0113] As described above, in this embodiment, the first fixing portion 41 is located near the side 13a (first end) of the base 10, and the second fixing portion 42 is located on the side opposite to the side 13a relative to the head 21 and on the side opposite to the side 13b (second end) of the base 10 relative to the neck 22.

[0114] In such a structure, the first fixing portion 41 and the second fixing portion 42 are both offset relative to the head 21 in the longitudinal direction of the head 21 (the X direction (first direction) or the direction opposite to the X direction). Assuming that at least one of the first fixing portion 41 and the second fixing portion 42 is offset relative to the head 21 in the Y direction (second direction), since the configuration area of ​​the first fixing portion 41 is ensured between the head 21 and the side surface 13b of the base 10, the head 21 and the side surface 13b have to be separated in the Y direction. As a result, there is a possibility that the optical device 1A will become larger in the width direction. In addition, if at least one of the first fixing portion 41 and the second fixing portion 42 is offset relative to the head 21 in the direction opposite to the Y direction, at least one of the first fixing portion 41 and the second fixing portion 42 is sandwiched between the head 21 and the circuit board 30, there is a possibility that the optical device 1A will become larger in the width direction. In this regard, according to the present embodiment, since the first fixing portion 41 and the second fixing portion 42 are offset in the longitudinal direction relative to the head portion 21 , it is easy to avoid the optical device 1A from becoming larger in the width direction.

[0115] Furthermore, if the second fixing portion 42 is offset in the Y direction relative to the neck 22, the area for the second fixing portion 42 to be positioned must be maintained between the neck 22 and the side surface 13b of the base 10. Consequently, the neck 22 and the side surface 13b must be separated in the Y direction, and the head 21 and the side surface 13b must also be separated in the Y direction. Consequently, there is a possibility that the optical device 1A will become larger in the width direction. Regarding this point, according to this embodiment, since the second fixing portion 42 is offset in the opposite direction of the Y direction relative to the neck 22, it is easier to prevent the optical device 1A from becoming larger in the width direction.

[0116] Furthermore, in a configuration where a cutout for accommodating the optical module 20 is provided in the circuit substrate, clearances must be maintained on both sides of the optical module 20 and the circuit substrate, potentially increasing the size of the optical device by the amount of clearance. Furthermore, wiring and an insulating layer must be routed around the cutout in the circuit substrate, potentially further increasing the size of the circuit substrate. Regarding this point, in this embodiment, the head 21 is positioned near the side surface 13b of the base 10, and the optical module 20 and circuit substrate 30 are arranged in the Y direction. This eliminates the need for a cutout in the circuit substrate 30 to accommodate the optical module 20, allowing the circuit substrate 30 to be configured in a more rectangular shape. This also allows for a more compact optical device 1A.

[0117] In this embodiment, for example, in the extension portion 431 (first extension portion), the flat portion 431b2 (first portion) is located on the side opposite to the base 10 with respect to the head portion 21. In addition, the curved portion 431a1, the flat portion 431b1, and the curved portion 431a2 (second portion) extend between the flat portion 431b2 and the first fixing portion 41. Figure 3 As shown, when viewed in the direction opposite to the Z direction (ie, the same also when viewed in the Z direction (third direction)), the first fixing portion 41 , the bent portion 431 a 1 , the flat portion 431 b 1 , and the bent portion 431 a 2 are arranged in the X direction.

[0118] Assuming that the first fixing portion 41 and the second portion between the first fixing portion 41 and the flat portion 431b2 (the first portion) are arranged in the Y direction, the second portion covers the area of ​​the top surface 12 of the base 10 that is adjacent to the first fixing portion 41 in the Y direction or the direction opposite to the Y direction in the Z direction, and therefore there is a possibility that the adjacent area will be difficult to utilize. In this regard, in this embodiment, the first fixing portion 41 and the second portion are arranged in the X direction. Therefore, the area of ​​the top surface 12 that is adjacent to the first fixing portion 41 in the Y direction or the direction opposite to the Y direction can be more effectively utilized as, for example, an area for providing the opening 15a and the peripheral portion 15b (mounted portion) for mounting the base 10 on another component. Accordingly, compared with a structure in which the opening 15a and the peripheral portion 15b are provided in other areas of the base 10, the base 10 and the optical device 1A can be constructed more compactly. However, the present invention is not limited to such a structure, and a portion or structure different from the opening 15a and the peripheral portion 15b, such as a fixing portion of the circuit substrate 30, may be provided in an area adjacent to the first fixing portion 41 in the Y direction or the opposite direction of the Y direction on the top surface 12.

[0119] In this embodiment, for example, in the extension portion 432 (second extension portion), the flat portion 432b2 (third portion) is located on the side opposite to the base 10 with respect to the head portion 21. In addition, the curved portion 432a1, the curved portion 432a2, and the flat portion 432b1 (fourth portion) extend between the flat portion 432b2 and the second fixing portion 42. Figure 3 As shown, when viewed in the direction opposite to the Z direction (ie, the same also when viewed in the Z direction), the curved portion 432a1, the curved portion 432a2, and the flat portion 432b1 are offset in the Y direction relative to the second fixing portion 42.

[0120] With such a structure, for example, a fourth portion between the second fixing portion 42 and the flat portion 432b2 (third portion) can be arranged in a space around the neck portion 22 offset in the Y direction relative to the second fixing portion 42, thereby making the optical device 1A more compact.

[0121] In addition, in this embodiment, Figure 3 As shown, when viewed in the direction opposite to the Z direction (i.e., the same also applies when viewed in the Z direction (third direction)), the curved portion 431a1, the flat portion 431b1, and the curved portion 431a2 (second portion) are offset relative to the first fixing portion 41 in the direction opposite to the X direction (the longitudinal direction), and the curved portion 432a1, the curved portion 432a2, and the flat portion 432b1 (fourth portion) are offset relative to the second fixing portion 42 in the Y direction (the width direction). In other words, when viewed in the third direction, the fourth portion is offset relative to the second fixing portion 42 in a direction (the Y direction) that intersects the direction in which the second portion is offset relative to the first fixing portion 41 (the direction opposite to the X direction).

[0122] Assuming that the second portion is offset in the longitudinal direction (e.g., opposite the X-direction) relative to the first fixing portion 41, and the fourth portion is also offset in the longitudinal direction (e.g., the X-direction) relative to the second fixing portion 42, and that the second portion and the fourth portion each have a portion extending in the Z-direction that faces the end faces 21c1 and 21c2, the second and fourth portions sandwich the head portion 21 in the longitudinal direction. If the pressing member 40A interferes with the head portion 21 in the X-direction, positioning the head portion 21 relative to the base 10 becomes problematic. Therefore, it is necessary to prevent interference between the second and fourth portions and the head portion 21. Therefore, in this case, a required longitudinal gap must be provided between the second portion and the head portion 21, and between the fourth portion and the head portion 21, respectively. This further separates the second and fourth portions in the longitudinal direction, forcing the first fixing portion 41 and the second fixing portion 42 to be separated in the longitudinal direction. Consequently, there is a possibility that the optical device 1A will become larger in the longitudinal direction. Furthermore, if the second portion is offset relative to the first fixing portion 41 in the width direction (e.g., opposite to the Y direction), and the fourth portion is offset relative to the second fixing portion 42 in the width direction (e.g., the Y direction), and the second and fourth portions each have a portion extending in the Z direction that faces the end faces 21d1 and 21d2, a similar problem arises, resulting in the optical device 1A potentially becoming larger in the width direction. Regarding this, in a configuration such as the present embodiment, in which the fourth portion is offset relative to the second fixing portion 42 in a direction (e.g., the Y direction) that intersects the direction in which the second portion is offset relative to the first fixing portion 41 (e.g., opposite to the X direction) when viewed from the third direction, the optical device 1A can be constructed more compactly in both the longitudinal and width directions. It should be noted that in the present embodiment, the direction in which the second portion is offset relative to the first fixing portion 41 (e.g., opposite to the X direction) and the direction in which the fourth portion is offset relative to the second fixing portion 42 (e.g., the Y direction) are orthogonal to each other, but this is not limiting; these directions may simply intersect.

[0123] In the present embodiment, for example, parts of the bent portion 432 a 1 and the bent portion 432 a 2 (fourth portion) are arranged on the side opposite to the side surface 13 b (second end portion) with respect to the neck portion 22 .

[0124] In this case, the space adjacent to the neck portion 22 on the opposite side in the Y direction can be used more effectively as a space for arranging the fourth portion.

[0125] In addition, in this embodiment, for example, Figure 6 As shown, when viewed in the X direction (first direction), the second fixing portion 42 partially overlaps with the head portion 21 .

[0126] Through such a structure, for example, the second fixing portion 42 can be arranged closer to the neck 22 in the Y direction, so that the optical device 1A can be constructed more compactly in the Y direction (width direction) compared to a structure in which the second fixing portion 42 is arranged so as not to overlap with the head 21 when viewed in the X direction and is further away from the neck 22 in the opposite direction of the Y direction.

[0127] In addition, in this embodiment, for example, in the intermediate portion 43 , the extending portion 431 and the extending portion 432 are integrally connected.

[0128] With such a structure, the pressing member 40A is formed into a single component, and advantages such as a reduction in the number of components and ease of handling can be achieved.

[0129] [Second embodiment]

[0130] Figure 7 is a top view of the optical device 1B according to this embodiment. Figure 8 It is a perspective view of the optical device 1B.

[0131] Will Figure 7 and Figure 3 Comparison shows that in this embodiment and the first embodiment, the first fixing portion 41 and the opening 15a and the peripheral portion 15b are arranged oppositely in the Y direction. That is, the opening 15a and the peripheral portion 15b are located offset in the Y direction (second direction) relative to the first fixing portion 41 of the pressing member 40B.

[0132] Even in such a configuration, the same effects as those in the first embodiment described above where the opening 15 a and the peripheral portion 15 b are offset in the opposite direction of the Y direction with respect to the first fixing portion 41 of the pressing member 40A can be obtained.

[0133] In addition, if Figure 8 As shown, the fourth portion 432c between the second fixing portion 42 and the flat portion 432b2 (third portion) meanders on the side opposite to the second fixing portion 42 relative to the neck 22. That is, the fourth portion 432c includes a portion 432c1 located between the neck 22 and the base 10 (stepped surface 14), and a portion 432c2 located closer to the side surface 13b (second end portion) of the base 10 than the neck 22.

[0134] In this configuration, the fourth portion 432c between the second fixing portion 42 and the flat portion 432b2 (third portion) can be arranged in a space around the neck portion 22, in this case, in a space offset in the opposite direction of the Z direction and in the Y direction relative to the neck portion 22, thereby enabling a correspondingly more compact configuration of the optical device 1B. Furthermore, with this configuration, for example, the extension portion 432 and thus the pressing member 40B can be made longer, thereby further reducing the stress generated in the pressing member 40B and further improving the reliability of the pressing member 40B.

[0135] [Third embodiment]

[0136] Figure 9 : is a perspective view of the optical device 1C of this embodiment. Figure 9 As shown, in this embodiment, the fixing member 53 fixes the circuit board 30 and the second fixing portion 42 of the pressing member 40A to the base 10. It should be noted that the pressing member 40A has parts with different sizes, but has the same shape as the first embodiment. The fixing member 53 is an example of a fixing member.

[0137] With this structure, by using common fixings, for example, compared to a structure in which the circuit board 30 and the pressing member 40A are attached to the base 10 using separate fixings 51 and 52, the number of fixings and components can be reduced, and the number of steps required for manufacturing and fixing can be reduced, thereby reducing manufacturing labor and costs. Furthermore, the area of ​​the circuit board 30 can be increased, thereby allowing for the placement of more components.

[0138] It should be noted that in this embodiment, the base 10, circuit board 30, and second fixing portion 42 are arranged in sequence in the Z direction. In other words, the circuit board 30 is located between the second fixing portion 42 and the base 10. Furthermore, a common fixing member can also be used for the first fixing portion 41.

[0139] [First Modification]

[0140] Figure 10 1D is a side view of the optical device 1D of this modification when viewed in the X direction. Figure 10 As shown, in this modification, as in the third embodiment, the fixing member 53 fixes the circuit board 30 and the second fixing portion 42 to the base 10. It should be noted that in this modification, the pressing member 40A also has parts of different sizes, but has the same shape as the first and third embodiments.

[0141] However, in this variation, the base 10, second fixing portion 42, and circuit board 30 are arranged in sequence in the Z direction. In other words, the second fixing portion 42 is located between the circuit board 30 and the base 10. This structure also achieves the same effects as the third embodiment. Furthermore, in this case, the first fixing portion 41 can also share a similar fixing member.

[0142] [Second Modification]

[0143] Figure 11 FIG is a top view of the optical device 1E of this modification. Figure 11 As shown, in this modified example, the pressing member 40E is separated at the middle portion 43, being divided into a member 40E1 having an extension portion 431 and a member 40E2 having an extension portion 432. Other than this, the optical device 1E has the same structure as the first embodiment. Even with this structure, the head 21 can be pressed against the base 10 via the extension portions 431 and 432. Aside from the separation, the first fixing portion 41, the second fixing portion 42, the extension portion 431, and the extension portion 432 are arranged and structured in the same manner as in the first embodiment, thereby achieving the same effects as in the first embodiment. Furthermore, for example, the material used for the pressing member 40E may be further reduced, thereby correspondingly reducing manufacturing costs.

[0144] [Third Modification]

[0145] Figure 12 FIG is a top view of the optical device 1F of this modification. Figure 12 As shown, in this modified example, the extension portion 431 (first extension portion) of the pressing member 40F has a portion 431d2 whose width in the Y direction is different from (thicker than) that of the other portion 431d1, and the extension portion 432 (second extension portion) has a portion 432d2 whose width in the Y direction is different from (thicker than) that of the other portion 432d1. In this modified example, the extension portions 431 and 432 form an integrally connected intermediate portion 43, and a protrusion 43a is provided in the longitudinal middle portion of the intermediate portion 43, which protrudes in the opposite direction of the Y direction.

[0146] According to such a structure, the area where the pressing member 40F presses the head 21 can be expanded, thereby suppressing the deviation of the pressing force caused by the different positions of the head 21, and further suppressing the unilateral contact between the head 21 and the base 10. In other words, the tilt of the head 21 relative to the base 10 can be suppressed.

[0147] [Fourth Modification]

[0148] Figure 13 FIG. 1 is a top view of the optical device 1G of this modification. Figure 13 As shown, in this modified example, the extension portion 431 (first extension portion) of the pressing member 40G also has a portion 431d2 whose width in the Y direction is different from (thicker than) that of the other portion 431d1, and the extension portion 432 (second extension portion) also has a portion 432d2 whose width in the Y direction is different from (thicker than) that of the other portion 432d1. In this modified example, the extension portions 431 and 432 also form an integrally connected intermediate portion 43. Widened portions 43a1 and 43a2 are provided at both ends of the intermediate portion 43 in the longitudinal direction, protruding in the Y direction and in the opposite direction of the Y direction. Widened portions 43a1 and 43a2 are examples of protrusions.

[0149] According to such a structure, the area where the pressing member 40G presses the head 21 can also be expanded, thereby suppressing the deviation of the pressing force caused by the different positions of the head 21, and further suppressing the unilateral contact between the head 21 and the base 10. In other words, the tilt of the head 21 relative to the base 10 can be suppressed.

[0150] Alternatively, the elastic member 44 may be interposed between the portions 431d2 and 432d2 (widened portions 43a1 and 43a2) that are wider than the other portions and the top surface 21b of the head portion 21. In this case, for example, the elastic member 44 can be prevented from protruding from the intermediate portion 43, thereby improving the reliability of the elastic member 44.

[0151] The above examples illustrate the embodiments and modifications of the present invention, but the above embodiments and modifications are examples and are not intended to limit the scope of the invention. The above embodiments and modifications can be implemented in various other ways, and various omissions, substitutions, combinations, and changes can be made without departing from the scope of the main purpose of the invention. In addition, the specifications such as each structure and shape (structure, type, direction, type, size, length, width, thickness, height, number, configuration, position, material, etc.) can be appropriately changed for implementation.

[0152] For example, the positions of the first fixing portion and the second fixing portion in the Z direction (thickness direction) can be changed as appropriate.

Claims

1. An optical device, wherein: The optical device comprises: a base having a first end in a first direction and a second end extending along the first direction as an end in a second direction intersecting the first direction; an optical module having a head and a neck, the head being adjacent to the base in a third direction intersecting the first direction and the second direction and being located near the second end with a longitudinal direction of the head along the first direction, the neck protruding from the head in a direction opposite to the first direction and being thinner than the head; a substrate, which is arranged with the head along the second direction, and the substrate is mounted on the base; as well as The pressing member includes a first fixing portion, a second fixing portion, and an intermediate portion. The first fixing portion is fixed to the base at a position close to the first end portion. The second fixing portion is fixed to the base on a side opposite to the first end portion relative to the head portion and on a side opposite to the second end portion relative to the neck portion. The intermediate portion includes a first extending portion and a second extending portion. The first extension portion has a curved portion and a flat portion, and extends from the first fixing portion. The second extension portion is a portion different from the first extension portion, has a curved portion and a flat portion, and extends from the second fixing portion. The flat portion of at least one of the first extension portion and the second extension portion serves as a pressing portion, and the pressing portion presses a portion of the head against the base in a direction opposite to the third direction. The pressing member has only one first fixing portion and one second fixing portion as fixing portions fixed to the base.

2. The optical device according to claim 1, wherein The first extension portion has a first portion and a second portion, the first portion is located on the side opposite to the base relative to the head in the third direction, the second portion extends between the first portion and the first fixed portion, and when viewed along the third direction, the first fixed portion and the second portion are arranged along the first direction.

3. The optical device according to claim 1, wherein The optical device includes a mounted portion located at a position offset from the first fixing portion in the second direction or in a direction opposite to the second direction, and to which a fixing member for fixing the base to another member is mounted.

4. The optical device according to claim 1, wherein The second extension portion has a third portion and a fourth portion, the third portion is located on the side opposite to the base relative to the head in the third direction, and the fourth portion extends between the third portion and the second fixed portion. When viewed along the third direction, the fourth portion is located at a position offset toward the second direction relative to the second fixed portion.

5. The optical device according to claim 4, wherein A portion of the fourth portion is located on the opposite side of the second end portion relative to the neck portion.

6. The optical device according to claim 4, wherein The fourth portion is partially located between the neck and the base, and partially located closer to the second end portion than the neck.

7. The optical device according to claim 1, wherein The second fixing portion is located at a position overlapping with the head portion when viewed in the first direction.

8. The optical device according to claim 1, wherein At least one of the first fixing portion and the second fixing portion is mounted on the base via a fixing member. The substrate is mounted on the base through the fixing member.

9. The optical device according to claim 8, wherein The substrate is located between the base and at least one of the first fixing portion and the second fixing portion.

10. The optical device according to claim 8, wherein At least one of the first fixing portion and the second fixing portion is located between the substrate and the base.

11. The optical device according to any one of claims 1 to 10, wherein: The first extension portion and the second extension portion are integrally connected.

12. The optical device according to any one of claims 1 to 10, wherein: The first extension portion and the second extension portion are separated from each other.

13. The optical device according to any one of claims 1 to 10, wherein: The first extension portion has portions having different widths in the second direction.

14. The optical device according to any one of claims 1 to 10, wherein: The second extending portion has portions having different widths in the second direction.

15. The optical device according to any one of claims 1 to 10, wherein: At least one of the first extension portion and the second extension portion has a protrusion that protrudes in the second direction or in a direction opposite to the second direction.

16. The optical device according to any one of claims 1 to 10, wherein: The optical module includes a semiconductor laser.

17. The optical device according to any one of claims 1 to 10, wherein: The optical module has a wavelength-variable laser.

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