JP4383284B2 - Socket cover mounting structure for fluorescent lamp unit - Google Patents

Description

  The present invention relates to a socket cover mounting structure in a fluorescent lamp unit which is a lighting fixture using a fluorescent lamp.

  Conventionally, fluorescent lamp units shown in FIG. 7 and FIGS. 8A to 8D are known as lighting fixtures that perform illumination using a fluorescent lamp. The fluorescent lamp unit 101 in FIGS. 7 and 8A to 8D includes a main body case 103 to which a pair of sockets 102 are attached, and two socket covers 104. The fluorescent lamp unit 101 is configured such that a fluorescent lamp 105 is attached between the sockets 102. The main body case 103 and the socket cover 104 are formed, for example, by extrusion using a metal material. The socket cover 104 improves the appearance of the fluorescent lamp unit 101 by covering the socket 102 when the fluorescent lamp 105 is not replaced. In the state where the socket cover 104 covers the socket 102, it becomes an obstacle when the fluorescent lamp 105 is replaced. Therefore, the socket cover 104 is configured to be slidable with respect to the main body case 103.

  However, when replacing the fluorescent lamp 105 attached to the socket 102, the fluorescent lamp unit 101 slides both the socket covers 104 covering both sockets 102 outward, so that the main body case has a lot of momentum. The socket cover 104 may be detached from the 103. If the socket cover 104 is detached from the main body case 103, the operator has to attach the socket cover 104 to the main body case 103, and there is a problem that the replacement work efficiency of the fluorescent lamp 105 is deteriorated. . Furthermore, there is a problem that the socket cover 104 cannot be positioned when the socket cover 104 is slid.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a socket cover mounting structure in a fluorescent lamp unit that can prevent the socket cover from being detached from the main body case when the fluorescent lamp is replaced. There is.

In order to achieve the above object, the invention according to claim 1 is a socket that slides between two positions: a covering position that covers a socket of a fluorescent lamp attached to a main body case, and an exposed position that exposes the socket. A cover is attached to the main body case, and the socket cover is detached from the main body case by sliding the socket cover toward the side opposite to the covering position with respect to the exposed position. In the mounting structure, the main body case includes a restricting member that restricts the socket cover from sliding from the exposed position toward the opposite side of the covering position .

According to a second aspect of the present invention, in the first aspect of the present invention, the main body case includes a pair of guide recesses extending along the sliding direction, and the socket cover includes the two guide recesses. A pair of guide ribs that are slidably guided by the strips are provided, the guide ribs include a first locking portion and a second locking portion, and the socket cover is covered with the cover. A locking projection that engages with the first locking portion when positioned at the position and engages with the second locking portion when the socket cover is positioned at the exposed position is provided.

The invention of claim 3 is the invention according to 請 Motomeko 2, wherein the socket cover is provided with a shielding portion which forms a U-shaped cross section in which the guide ribs are connected respectively to both ends, the guide concave portion Are formed with rounded corners for avoiding contact with the corners formed by the guide ribs and the shielding portions.

The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the main body case and the socket cover are provided between the main body case and the socket cover. A line contact mechanism in which at least a part of the contact is a line contact or a point contact mechanism in which at least a part of the contact between the main body case and the socket cover is a point contact is provided.
According to a fifth aspect of the present invention, in the second or third aspect of the invention, the first locking portion is a locking recess formed by cutting out at a tip end portion of the guide rib, and the second locking portion. The locking portion is a locking step portion formed in a notch at the tip end portion of the guide rib, and the locking recess and the locking step portion of the guide rib are between the locking recess and the locking step. A guide surface is provided with a depth of cut toward the step.

(Function)
According to the first aspect of the invention, the following effects are obtained. When the socket cover is slid from the covering position to the exposed position, even if the socket cover tries to slide to a position beyond the exposed position, the sliding movement of the socket cover is restricted by the restriction member. As a result, when the fluorescent lamp is replaced, the socket cover is further prevented from being detached from the main body case.

According to invention of Claim 2, in addition to the effect | action of invention of Claim 1, the effect | action shown below is acquired. When replacing the fluorescent lamp attached to the socket of the main body case, move the socket cover located at the covering position toward the exposed position while releasing the engagement between the first locking portion and the locking protrusion. Let When the socket cover reaches the exposed position, the second locking portion and the locking protrusion are engaged, and the socket cover is positioned with respect to the main body case. By this positioning, the socket cover is suppressed from being detached from the main body case. When the socket cover is located at the exposed position, the socket is exposed, so that the fluorescent lamp can be replaced from the socket. After replacing the fluorescent lamp, the socket cover is moved toward the covering position while releasing the engagement between the second locking portion and the locking protrusion. When the socket cover reaches the covering position, the first locking portion and the locking projection are engaged, the socket cover is positioned with respect to the main body case, and the fluorescent lamp replacement operation is completed.

According to the invention described in claim 3, to obtain the effect described below in addition to the effect of the invention described in 請 Motomeko 2. Since the guide recess is not in contact with the corner formed by the guide rib and the shield, the socket cover can be smoothly slid relative to the main body case. By the way, if the guide recess is in contact with the corner formed by the guide rib and the shield, the guide recess will bite into the corner when the socket cover slides. The slide movement may not be performed smoothly.

According to the invention described in claim 4, in addition to the action of the invention described in any one of claims 1 to 3, the following action is obtained. By providing the line contact mechanism, the socket cover can be smoothly moved relative to the main body case. Alternatively, by providing the point contact mechanism, the socket cover can be smoothly slid relative to the main body case.
According to the invention described in claim 5, in addition to the action of the invention described in claim 2 or claim 3, the following action is obtained. Since the guide surface is formed so that the depth of cut increases from the locking recess to the locking step, when the socket cover is moved from the covering position to the exposed position, the locking protrusion The sliding contact resistance with the guide surface gradually decreases. As the sliding contact resistance decreases, the socket cover can be moved with a light force as it is moved from the covering position to the exposed position. For this reason, when the socket cover is moved from the covering position to the exposed position, the locking step portion of the socket cover can be gently brought into contact with the locking protrusion. By gently bringing the locking step portion into contact with the locking protrusion, the socket cover is prevented from being detached from the main body case beyond the exposed position.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that a socket cover detaches | leaves from a main body case at the time of fluorescent lamp replacement | exchange.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIGS. 1A to 1D, the fluorescent lamp unit 11 includes a main body case 12, a pair of sockets 13, and a pair of socket covers 14. The body case 12 and both socket covers 14 are formed by extrusion using a metal material (synthetic resin may be used).

  The upper part of the main body case 12 is fixed to a ceiling (not shown). The main body case 12 is formed in a long rectangular shape in a bottom view (see FIG. 1A), the direction in which the short side extends is the short direction S, and the direction in which the long side extends is the sliding direction. In the longitudinal direction L.

As shown in FIG. 2, the main body case 12 includes a central portion 12a and umbrella portions 12b formed at both ends in the short direction S of the central portion 12a.
As shown in FIGS. 1A and 1C, a pair of sockets 13 are fixed to the lower surface of the central portion 12a and to both ends in the longitudinal direction L of the central portion 12a. A fluorescent lamp 15 is attached between the sockets 13.

  As shown in FIG. 2, the lower surface of the central portion 12 a includes a pair of guide concave portions 16 whose recesses 16 a face each other in the short direction S. The guide recess 16 is formed over the entire length L of the central portion 12a (see FIGS. 1A and 1B). More specifically, as shown in FIG. 3, the guide recess 16 includes an L-shaped protrusion 17 extending from the lower surface of the central portion 12a. A protrusion 18 extending downward from the tip is formed at the tip of the protrusion 17. The guide recess 16 is constituted by a part of the central portion 12 a, the protrusion 17, and the protrusion 18.

  As shown in FIG. 2, the socket cover 14 includes a shielding portion 14a having a U-shaped cross section and capable of shielding the socket 13, and guide ribs 14b integrally formed at both ends of the shielding portion 14a. . Both guide ribs 14b are formed in the short direction S so as to extend away from the end of the shielding portion 14a. Both guide ribs 14b are respectively disposed in the pair of recesses 16a. As a result, the socket cover 14 is configured to be slidable along the longitudinal direction L with respect to the main body case 12.

Next, a characteristic configuration of the fluorescent lamp unit 11 will be described.
As shown in FIGS. 2 and 3, a ridge portion 20 having a semicircular cross section is formed on the lower surface corresponding to the recess 16 a of the central portion 12 a. The protruding portion 20 corresponds to a line contact mechanism. The protruding portion 20 is formed over the entire length direction L of the central portion 12a. The upper part of the tip of the protrusion 17 is a rounded corner 21. The rounded corner 21 is formed over the entire length L of the protrusion 17. By forming the rounded corner portion 21 in the protruding portion 17, contact between the tip end portion of the protruding portion 17 and the corner n formed by the guide rib 14 b and the shielding portion 14 a is avoided. The upper surface of the guide rib 14b is in contact with the ridge portion 20, the lower surface of the guide rib 14b is in contact with the upper surface on the distal end side of the protruding portion 17, and both outer side surfaces F1 in the short direction S of the shielding portion 14a are a pair of protrusion portions. 18 are respectively in contact with both inner side surfaces F2 in the short direction S. That is, the socket cover 14 is attached to the main body case 12 so as to suppress backlash.

  The socket cover 14 shown in FIG. 4 shows the left socket cover 14 of FIG. 1A, and the socket cover 14 shown in FIG. 5 shows the left socket cover 14 of FIG. 1C. As shown in FIGS. 4 and 5, the guide rib 14b has a base end portion integrally connected to the shielding portion 14a, and has a locking recess 22 as a first locking portion and a distal end portion thereof. A locking step portion 23 as a second locking portion is cut out. In the guide rib 14b, the locking step 23 is formed on the inner side Li side in the longitudinal direction from the position where the locking recess 22 is formed.

  The longitudinal inward Li refers to a direction from the end of the main body case 12 toward the center of the main body case 12 in the longitudinal direction L, and a direction opposite to the longitudinal inward Li is referred to as a longitudinal outward Lo.

  The depth of the bottom corner 23 a of the locking step 23 is the same as the depth of the bottom surface 22 a of the locking recess 22. The guide rib 14b is positioned so that the tip surface of the portion between the locking recess 22 and the locking step portion 23 is located on the inner side Si side in the lateral direction from the tip surfaces of the other portions of the guide rib 14b, and It forms so that it may be located in the transversal direction outward So side from the corner | angular part 23a of the bottom of the latching step part 23. FIG.

  Note that the short-side inward Si refers to a direction from the tip of the guide rib 14b toward the base end of the guide rib 14b, and a direction opposite to the short-side inward Si is referred to as a short-side outward So. Hereinafter, the tip surface of the portion between the locking recess 22 and the locking step 23 in the guide rib 14 b is referred to as a guide surface 24.

  The guide surface 24 includes a parallel surface 24a and an inclined surface 24b. The parallel surface 24 a is formed from the center in the longitudinal direction L of the guide surface 24 to the locking recess 22, and the inclined surface 24 b is formed from the center in the longitudinal direction L of the guide surface 24 to the locking step portion 23. The parallel surface 24 a is formed so as to be positioned on the outer side So side in the lateral direction with respect to the bottom surface 22 a of the locking recess 22. The inclined surface 24 b is formed so as to be directed inward in the lateral direction Si toward the locking step 23, and is smoothly connected to the corner 23 a at the bottom of the locking step 23. That is, the guide surface 24 is formed so that the cutting depth increases from the locking recess 22 toward the locking step 23.

  A spring pin 25 having a C-shaped cross section is fixed to the central portion 12a of the main body case 12 so as to substantially face each guide surface 24. The spring pin 25 corresponds to a locking projection. The spring pin 25 is configured to be elastically deformable. The spring pin 25 is fixed to the central portion 12a so as to be able to engage with the locking recess 22, to be able to engage with the locking step 23, and further to be slidable into contact with the guide surface 24. More specifically, when the spring pin 25 is engaged with the locking recess 22 of the socket cover 14, the fluorescent light is emitted so that the socket cover 14 is positioned at a position where the socket cover 14 covers the socket 13 (hereinafter referred to as a covering position P1). The lamp unit 11 is configured. Further, when the spring pin 25 is engaged with the locking step portion 23 of the socket cover 14, the fluorescent light is so positioned that the socket cover 14 is located at a position where the socket 13 is exposed (hereinafter referred to as an exposed position P 2). The lamp unit 11 is configured.

  As shown in FIGS. 1A, 1 </ b> C, and 2, four spring pins 26 having a C-shaped cross section are fixed to the central portion 12 a of the main body case 12 in a state of being pierced. The spring pin 26 corresponds to a restricting member. The spring pin 26 is configured to be elastically deformable. Each spring pin 26 is arranged at the same position as each spring pin 25 in the lateral direction S.

  Each spring pin 26 abuts on the socket cover 14 when the corresponding socket cover 14 moves by a predetermined amount from the exposed position P2 toward the outer side in the longitudinal direction Lo. Is prevented from moving outward in the longitudinal direction Lo. Incidentally, when the socket cover 14 is in contact with the spring pin 26, both guide ribs 14 b are not separated from the guide recess 16.

Therefore, according to this embodiment, the following operations and effects can be obtained.
(1) When replacing the fluorescent lamp 15 attached to the socket 13 of the main body case 12, the socket cover 14 located at the covering position P1 is released from the engagement between the locking recess 22 and the spring pin 25. Move toward the exposure position P2.

  At this time, the spring pin 25 first comes into sliding contact with the parallel surface 24 a of the guide surface 24 and then comes into sliding contact with the inclined surface 24 b of the guide surface 24. That is, since the guide surface 24 is formed so as to have a deeper cut depth from the locking recess 22 toward the locking step 23, when the socket cover 14 is moved toward the exposed position P2, the spring The sliding resistance between the pin 25 and the guide surface 24 is gradually reduced. As the sliding contact resistance decreases, the socket cover 14 can be moved with a light force as the socket cover 14 is moved toward the exposure position P2. For this reason, when the socket cover 14 is moved to the exposed position P2, the locking step portion 23 of the socket cover 14 can be gently brought into contact with the spring pin 25. By gently bringing the locking step 23 into contact with the spring pin 25, it is possible to prevent the socket cover 14 from moving beyond the exposed position P2 and moving outward in the longitudinal direction Lo.

  When the socket cover 14 reaches the exposed position P <b> 2, the locking step portion 23 and the spring pin 25 are engaged, and the socket cover 14 is positioned with respect to the main body case 12. By performing this positioning, the socket cover 14 is suppressed from moving from the exposed position P2 toward the outer side Lo in the longitudinal direction. When the socket cover 14 is positioned at the exposure position P2, the socket 13 is exposed, so that the fluorescent lamp 15 can be replaced from the socket 13. After replacing the fluorescent lamp 15, the socket cover 14 is moved toward the covering position P1 while releasing the engagement between the locking step portion 23 and the spring pin 25.

  At this time, the spring pin 25 first comes into sliding contact with the inclined surface 24 b of the guide surface 24 and then comes into sliding contact with the parallel surface 24 a of the guide surface 24. That is, since the guide surface 24 is formed so that the cutting depth becomes shallower from the locking step portion 23 toward the locking recess portion 22, when the socket cover 14 is moved toward the covering position P1, the spring is moved. The sliding contact resistance between the pin 25 and the guide surface 24 is gradually increased. As this sliding contact resistance increases, it is necessary to move the socket cover 14 with a large force as the socket cover 14 is moved toward the covering position P1, and accordingly, the contact with the guide surface 24 (parallel surface 24a). A step with the bottom surface 22a of the locking recess 22 can be secured, and the engagement between the locking recess 22 and the spring pin 25 can be suitably maintained.

  When the socket cover 14 reaches the covering position P1, the locking recess 22 and the spring pin 25 are engaged, the socket cover 14 is positioned with respect to the main body case 12, and the fluorescent lamp replacement operation is completed. Therefore, it is possible to prevent the socket cover 14 from being detached from the main body case 12 when replacing the fluorescent lamp.

  (2) When the socket cover 14 is slid from the covering position P1 to the exposed position P2, the socket cover 14 comes into contact with the spring pin 26 even if the socket cover 14 tries to slide to a position beyond the exposed position P2. This prevents the socket cover 14 from sliding further outward in the longitudinal direction Lo. Therefore, it is possible to reliably prevent the socket cover 14 from being detached from the main body case 12 when the fluorescent lamp is replaced.

  (3) As shown in FIG. 3, a rounded corner 21 for avoiding contact with the corner n formed by the guide rib 14b and the shielding portion 14a is formed at the upper portion of the tip of the protruding portion 17. Since the tip of the guide recess 16 does not come into contact with the corner n, the socket cover 14 can be smoothly slid relative to the main body case 12. Incidentally, if the tip of the guide recess 16 contacts the corner n, when the socket cover 14 slides, the tip of the guide recess 16 bites into the corner n. The slide movement may not be performed smoothly.

  (4) On the lower surface of the main body case 12 corresponding to the recess 16a of the central portion 12a, a ridge portion 20 having a semicircular cross section was formed. In other words, the protrusion 20 makes the contact between the central portion 12a of the main body case 12 and the guide rib 14b of the socket cover 14 a line contact. Since the center portion 12a and the guide rib 14b are in line contact, sliding resistance can be reduced as compared with the case where they are in surface contact, and the sliding movement of the socket cover 14 with respect to the main body case 12 can be performed smoothly. . In the fluorescent lamp unit 11, the upper surface of the guide rib 14b is brought into contact with the protruding portion 20, the lower surface of the guide rib 14b is brought into contact with the upper surface on the distal end side of the protruding portion 17, and both outer side surfaces F1 of the shielding portion 14a are paired. The socket cover 14 is attached to the main body case 12 so as to prevent rattling by making contact with both inner side surfaces F <b> 2 of the protrusion 18. As described above, since the backlash between the socket cover 14 and the main body case 12 is suppressed, a rattling sound is generated even when the fluorescent lamp unit 11 is attached to a vehicle or the like that generates vibration. Is suppressed. Furthermore, although the socket cover 14 and the main body case 12 are configured to suppress backlash, the center portion 12a and the guide rib 14b are in line contact, so that the socket cover 14 is attached to the main body case 12. Smooth sliding movement is possible. Therefore, the fluorescent lamp unit 11 can smoothly perform the fluorescent lamp replacement work while suppressing the rattling noise.

  (5) The protrusion 20 can be formed simultaneously when the main body case 12 is formed by extrusion. Therefore, the manufacturing cost of the fluorescent lamp unit 11 can be reduced as compared with the case where the main body case 12 and the protruding portion 20 are formed separately and fixed to each other later.

  (6) The spring pin 25 has a C-shaped cross section and can be elastically deformed. Therefore, when the engagement between the locking recess 22 and the spring pin 25 is released, the spring pin 25 is preferably elastically deformed when the engagement between the locking step portion 23 and the spring pin 25 is released. The above cancellation can be performed.

In addition, you may change the said embodiment into the following aspects.
In the above-described embodiment, the ridge portion 20 having a semicircular cross section is formed only on the lower surface corresponding to the recess 16a of the central portion 12a. Not only this but as shown to Fig.6 (a), you may form the protrusion 30 with the cross-sectional semicircle shape in the upper surface at the front end side of the protrusion part 17. As shown in FIG. The protrusion 30 corresponds to a line contact mechanism. Further, the protruding portion 20 may be omitted, and only the protruding portion 30 may be formed on the upper surface on the distal end side of the protruding portion 17.

  As shown in FIG. 6 (b), a protrusion 31 that serves as both the protrusion 30 and the rounded corner 21 may be formed on the upper surface of the tip of the protrusion 17. The protrusion 31 corresponds to a rounded corner and a line contact mechanism.

  -In the said embodiment, the protrusion part 20 was formed in the center part 12a. Not only this but as shown in FIG.6 (c), you may form the protrusion part 20 in the upper surface and lower surface of the guide rib 14b. Moreover, you may make it form the protrusion part 20 in at least one among the upper surface and lower surface of the guide rib 14b.

  In the above-described embodiment, the protrusion 20 having a semicircular cross section is formed in the central portion 12a of the main body case 12 over the entire longitudinal direction L of the central portion 12a. Not limited to this, a hemispherical protrusion is formed on the lower surface corresponding to the recess 16a of the central portion 12a, and the protrusion makes contact between the central portion 12a of the main body case 12 and the guide rib 14b of the socket cover 14. The fluorescent lamp unit 11 may be configured to be in contact. This protrusion corresponds to a point contact mechanism. If comprised in this way, compared with the case where the contact of the center part 12a and the guide rib 14b is made into a line contact, since the contact area is small, the sliding movement of the socket cover 14 with respect to the main body case 12 can be performed more smoothly. it can.

  In the above-described embodiment, the upper part of the tip part of the projecting part 17 is the rounded corner part 21 forming an arc, but a slope may be formed on the upper part of the tip part of the projecting part 17. That is, a chamfer may be formed on the top of the tip of the protrusion 17.

In the above-described embodiment, the upper part of the tip portion of the projecting portion 17 is the rounded corner portion 21, but the present invention is not limited thereto, and may be a square corner portion.
In the embodiment, the fluorescent lamp unit 11 includes the spring pin 26, but the spring pin 26 may be omitted.

  In the embodiment, instead of the spring pin 25 having a C-shaped cross section, a columnar locking pin as a locking protrusion or a cylindrical locking pin as a locking protrusion may be used. Further, instead of the spring pin 26 having a C-shaped cross section, a cylindrical locking pin as a restricting member may be used.

  -In the said embodiment, although the fluorescent lamp unit 11 was provided with the protrusion part 20 and the corner rounding part 21, you may abbreviate | omit them. That is, the fluorescent lamp unit 11 includes a locking recess 22, a locking step 23, a guide surface 24, and spring pins 25 and 26 in addition to the fluorescent lamp unit 101 shown in FIGS. 7 and 8A to 8D. The central portion (12a) of the main body case (12) and the guide rib (14b) of the socket cover 14 may be configured to be in surface contact.

Next, the technical idea that can be grasped from the above embodiment and the change of the aspect will be additionally described below.
(A) The first locking portion is a locking recess formed in a tip portion of the guide rib, and the second locking portion is a locking step formed in a tip portion of the guide rib. A guide surface having a depth of cut from the locking recess toward the locking step between the locking recess and the locking step in the guide rib. A mounting structure for a socket cover in a fluorescent lamp unit according to any one of claims 1 to 3. With this configuration, the guide surface is formed so that the depth of cut becomes deeper from the locking recess to the locking step, so that when the socket cover is moved from the covering position to the exposed position, The sliding contact resistance between the locking projection and the guide surface is gradually reduced. As the sliding contact resistance decreases, the socket cover can be moved with a light force as it is moved from the covering position to the exposed position. For this reason, when the socket cover is moved from the covering position to the exposed position, the locking step portion of the socket cover can be gently brought into contact with the locking protrusion. By gently bringing the locking step portion into contact with the locking protrusion, the socket cover is prevented from being detached from the main body case beyond the exposed position.

(A) is a bottom view of the fluorescent lamp unit in which the socket cover of the present embodiment is in the covering position. (B) is a side view of the fluorescent lamp unit of the present embodiment. (C) is a bottom view of the fluorescent lamp unit in which the socket cover of the present embodiment is in the exposed position. (D) is a side view of the fluorescent lamp unit of the present embodiment. The side view of the fluorescent lamp unit of this embodiment. The elements on larger scale of FIG. The action figure which shows the relationship between a socket cover and a spring pin corresponding to Fig.1 (a). FIG. 4 is an operation diagram corresponding to FIG. 1C and showing a relationship between a socket cover and a spring pin. (A)-(c) is the partial expanded side view of the fluorescent lamp unit in the change of an aspect. The side view of the fluorescent lamp unit of a prior art. (A) is a bottom view of a fluorescent lamp unit in which a conventional socket cover is in a covering position. (B) is a side view of a conventional fluorescent lamp unit. (C) is a bottom view of a fluorescent lamp unit in which a conventional socket cover is in an exposed position. (D) is a side view of a conventional fluorescent lamp unit.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Fluorescent lamp unit, 12 ... Main body case, 13 ... Socket, 14 ... Socket cover, 14a ... Shielding part, 14b ... Guide rib, 15 ... Fluorescent lamp, 16 ... Guide concave part, 20 ... Projection as line contact mechanism 21, rounded corners 22, locking recesses as first locking parts, 23 locking steps as second locking parts, 25 spring pins as locking protrusions 26, regulating members Spring pin as L, longitudinal direction as slide direction, n, corner, P1, covering position, P2, exposure position.

Claims (5)

A socket cover that is slidable between two positions, a covering position that covers a fluorescent lamp socket attached to the main body case and an exposed position that exposes the socket, is attached to the main body case, and the socket cover is based on the exposed position. In the mounting structure of the socket cover in the fluorescent lamp unit in which the socket cover is detached from the main body case by sliding toward the opposite side to the covering position,
A mounting structure for a socket cover in a fluorescent lamp unit, wherein the main body case includes a regulating member that regulates the sliding movement of the socket cover from the exposed position toward the side opposite to the covering position. body. The main body case includes a pair of guide recesses extending along the sliding direction,
The socket cover includes a pair of guide ribs that are respectively slidably guided by the guide recesses.
The guide rib includes a first locking portion and a second locking portion,
The main body case engages with the first locking portion when the socket cover is located at the covering position, and engages with the second locking portion when the socket cover is located at the exposed position. The mounting structure of the socket cover in the fluorescent lamp unit according to claim 1, further comprising a locking projection that mates . The socket cover includes a shielding portion having a U-shaped cross section in which the guide ribs are connected to both ends thereof,
The guide concave portion, the fluorescent lamp unit according to 請 Motomeko 2 you, characterized in that corner rounding portion for avoiding contact with the corner portion formed between the guide rib and the shielding part are formed Mounting structure for socket cover in   Between the main body case and the socket cover, a line contact mechanism in which at least a part of contact between the main body case and the socket cover makes line contact, or among contact between the main body case and the socket cover. The mounting structure for a socket cover in a fluorescent lamp unit according to any one of claims 1 to 3, further comprising a point contact mechanism that makes at least part of the point contact.   The first locking portion is a locking recess formed in a notch at the tip of the guide rib,
  The second locking portion is a locking step portion formed by cutting out at a tip end portion of the guide rib,
  The guide rib having a depth of cut from the locking recess toward the locking step is provided between the locking recess and the locking step in the guide rib. A mounting structure for a socket cover in the fluorescent lamp unit according to claim 2 or claim 3.

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