JP5527109B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device.

  2. Description of the Related Art Conventionally, there has been known an illumination device that can automatically change the illumination angle of illumination light in accordance with the focal length of a photographing lens. This type of illumination device includes a zoom mechanism that moves the light source unit along the direction of illumination light irradiation (see, for example, Patent Document 1).

JP 2009-20298 A

  In the above illumination device, it is necessary to accurately position the light source unit in order to make the focal length of the photographing lens correspond to the illumination angle of the illumination light.

  The subject of this invention is providing the illuminating device which can position a light source unit correctly.

The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.
The invention according to claim 1 physically engages the light source unit (10) for irradiating illumination light, driving means for driving the light source unit along a predetermined direction, and the light source unit and the driving means. Engaging means, and the driving means converts a rotational force generated by the motor (21) generating a rotational force into a predetermined direction and extending in a predetermined direction into a linear motion in the predetermined direction. And the engaging means includes a pressure spring (24) for transmitting the linear motion of the screw portion to the light source unit, and the pressure spring is bent into a substantially U shape. The first side part (24a) and the second side part (24b), and the first side part is physically engaged with the screw part in an elastically deformed state, and the second side part Is characterized in that both end portions thereof are fixed to the light source unit. That is a lighting device (1).
According to a second aspect of the present invention, in the illumination device (1) according to the first aspect, the pressurizing spring (24) is configured so that the second side portion (from the middle position of the first side portion (24a)) 24b) is engaged with the screw portion (24) up to a position where it is connected.
The invention according to claim 3 is the illumination device (1) according to claim 1 or 2, further comprising a plurality of guide bars (23a, 23b) arranged substantially parallel to the screw portion (24), The light source unit (10) is movably engaged along the plurality of guide bars.
According to a fourth aspect of the present invention, in the illuminating device (1) according to any one of the first to third aspects, the light source unit (10) is a groove (13d) that houses the pressure spring (24). ), And the pressurizing spring is housed such that a predetermined interval is formed between the pressing spring and the side wall of the groove.
According to a fifth aspect of the present invention, in the illumination device (10) according to any one of the first to fourth aspects, the pressure spring (24) is a screw thread formed on the screw portion (22). It contacts the slope (22a).
Note that the configuration described with reference numerals may be modified as appropriate, and at least a part of the configuration may be replaced with another component.

  ADVANTAGE OF THE INVENTION According to this invention, the illuminating device which can position a light source unit correctly can be provided.

It is a schematic sectional drawing of the illuminating device 1 which concerns on embodiment. FIG. 3 is a perspective view of a light source unit 10 and a zoom mechanism unit 20. 2 is an external view of a pressure spring 24. FIG. FIG. 6 is a partial cross-sectional view of the reflector umbrella holder 13 that houses a pressure spring 24. It is a schematic diagram which shows the positional relationship of the part which the pressurization spring 24 and the screw part 22 engage. It is a schematic diagram which shows the state which the pressurization spring 24 and the screw part 22 contact | abut. It is a top view of the accommodation groove | channel 13d which accommodated the pressurization spring 24. FIG. (A), (b) is a schematic diagram which shows the positional relationship of the pressurization spring 24A and the screw part 22 in the comparative example 1. FIG. 6 is a schematic diagram showing a positional relationship between a pressure spring 24B and a screw portion 22 in Comparative Example 2. FIG. It is a schematic diagram which shows the positional relationship of the pressurization spring 24 and the screw part 22 in embodiment.

  Hereinafter, an embodiment of a lighting device according to the present invention will be described with reference to the drawings. In each of the drawings shown below, an XYZ orthogonal coordinate system is appropriately provided in order to facilitate explanation and understanding. In this coordinate system, the photographer is on the left side as viewed from the photographer at the camera position (hereinafter referred to as the normal position) when photographing a horizontally long image with the optical axis of a camera (not shown) equipped with a lighting device being horizontal. The direction to go is the X plus direction. Further, the direction toward the upper side in the normal position is defined as the Y plus direction. Further, the direction toward the subject at the normal position is taken as the Z direction.

  FIG. 1 is a schematic cross-sectional view of a lighting device 1 according to this embodiment. FIG. 2 is a perspective view of the light source unit 10 and the zoom mechanism unit 20.

  As illustrated in FIG. 1, the lighting device 1 includes a head portion 2 and a main body portion 3. The head unit 2 is a light emitting unit including a xenon tube (described later) serving as a light source. The main body unit 3 is a light emission control unit that controls irradiation of illumination light in the head unit 2.

  The head unit 2 includes a front cover 5, a main capacitor 6, a light source unit 10, and a zoom mechanism unit 20. FIG. 1 schematically shows configurations of the light source unit 10 and the zoom mechanism unit 20.

  The front cover 5 is an optical member for diffusing illumination light irradiated from a xenon tube 11 (described later) into a predetermined irradiation range. The front cover 5 is configured by a Fresnel lens having concentric Fresnel grooves (not shown).

  The main capacitor 6 is an electrical component for accumulating charges supplied to the xenon tube 11. The main capacitor 6 is connected to the xenon tube 11 together with a booster circuit (not shown).

  The light source unit 10 is a part that emits illumination light toward a subject (not shown). The light source unit 10 includes a xenon tube 11, a reflector 12, and a reflector holder 13. The xenon tube 11 is a light source that emits illumination light by the electric charge stored in the main capacitor 6. The reflector 12 is a reflecting member that reflects part of the illumination light emitted from the xenon tube 11 in the irradiation direction (Z direction). The reflector 12 has a substantially U-shaped cross section. The reflector umbrella 13 is a holding member that holds the xenon tube 11 and the reflector 12. The configuration of the reflector umbrella holder 13 will be described later.

  The zoom mechanism unit 20 is a moving mechanism that moves the light source unit 10 along the irradiation direction (Z direction) of illumination light. By moving the light source unit 10 along the irradiation direction, the distance between the front cover 5 and the xenon tube 11 changes. As the distance between the front cover 5 and the xenon tube 11 becomes shorter, the illumination angle of the illumination light becomes wider and the reach of the illumination light becomes shorter. When the distance between the front cover 5 and the xenon tube 11 is increased, the illumination angle of the illumination light is narrowed and the reach of the illumination light is increased.

  As shown in FIG. 2, the zoom mechanism unit 20 includes a motor 21, a screw portion 22, guide bars 23 a and 23 b, and a pressure spring 24.

  The motor 21 is a driving source that generates a driving force (rotational force) for moving the light source unit 10. The motor 21 is fixed inside the head unit 2. The screw portion 22 is directly connected to a rotation shaft (not shown) of the motor 21 and extends in the Z direction. A male screw is formed on the surface of the screw portion 22. A first side 24a (described later) of the pressure spring 24 is engaged with the male screw. When the screw portion 22 rotates, the thread of the male screw rotates spirally. For this reason, the pressure spring 24 (and the light source unit 10) that engages with the screw portion 22 moves in the Z direction as the screw portion 22 rotates. That is, the screw portion 22 functions as a member that converts the rotational force generated by the motor 21 into a linear motion in the Z direction. The motor 21 and the screw portion 22 constitute driving means for driving the light source unit 10 along the Z direction.

  As shown in FIG. 2, the guide bars 23 a and 23 b are support members arranged substantially in parallel with the screw portion 22. The guide bars 23a and 23b extend in the Z direction. The guide bars 23 a and 23 b are fixed inside the head portion 2.

  As shown in FIG. 2, engagement holes 13 a and 13 b are formed in the reflector umbrella holder 13 of the light source unit 10. The engagement holes 13a and 13b are through holes having diameters that can be engaged with the guide bars 23a and 23b. The guide bars 23 a and 23 b are engaged with the engagement holes 13 a and 13 b of the reflector holder 13. The light source unit 10 is supported so as to be movable along the Z direction in which the guide bars 23a and 23b extend.

  The pressure spring 24 is an engagement means that physically engages the light source unit 10 with the motor 21 and the screw portion 22. The pressure spring 24 is engaged with the screw thread of the screw portion 22 at one place. As shown in FIG. 2, a U-shaped groove 13 c and a storage groove 13 d are formed in the reflector umbrella holder 13 of the light source unit 10. The U-shaped groove 13c is a groove through which the screw portion 22 passes. The storage groove 13 d is a groove for storing the pressure spring 24. The storage groove 13d is formed in an oblique direction with respect to the screw portion 22 penetrating the U-shaped groove 13c in plan view.

  Further, both end portions of the pressure spring 24 are fixed by screws 25a and 25b. The screws 25 a and 25 b are screwed into screw holes (not shown) formed in the reflector holder 13. The screws 25a and 25b restrict the movement of the pressure spring 24 stored in the storage groove 13d in the Y direction. The configuration of the pressure spring 24 and the engagement between the pressure spring 24 and the screw portion 22 will be described later.

  The main body unit 3 includes a booster circuit, an operation unit, a power supply circuit, and a control unit (all not shown). Moreover, the main-body part 3 is provided with the attachment leg 4, as shown in FIG. The illuminating device 1 can be attached to an accessory shoe of a camera main body (not shown) by the mounting leg 4 of the main body 3. When the illuminating device 1 is mounted on the accessory shoe of the camera body, the electrode terminal (not shown) of the mounting leg 4 and the electrode terminal (not shown) of the accessory shoe come into contact and are electrically connected. Thereby, various signals and data can be transmitted and received between the camera body and the lighting device 1.

  When receiving the light emission signal synchronized with the shutter release from the camera main body, the control unit of the main body unit 3 supplies the charge accumulated in the main capacitor 6 to the xenon tube 11 to cause the xenon tube 11 to emit light. Further, the control unit of the main body unit 3 controls the rotation direction and the rotation amount of the motor 21 based on the zoom drive signal received from the camera main body, and moves the light source unit 10 engaged with the screw unit 22 in the Z direction. Move.

  The zoom drive signal is a signal (focal length information) transmitted from the camera body in accordance with the focal length of a photographing lens (not shown). The control unit of the main body unit 3 sets the illumination angle of the illumination light according to the received zoom drive signal. Further, the control unit sets a movement position of the light source unit 10 corresponding to the set irradiation angle, and supplies a pulse signal corresponding to the movement amount to the movement position to the motor 21.

  When the focal length of the photographic lens is shortened, the control unit of the main body 3 moves the light source unit 10 forward (subject side) along the Z direction so that the distance between the front cover 5 and the xenon tube 11 is reduced. Widen the illumination angle. Further, the control unit of the main body unit 3 moves the light source unit 10 rearward (on the opposite subject side) along the Z direction so that the distance between the front cover 5 and the xenon tube 11 increases as the focal length of the photographing lens increases. And narrow the illumination angle of the illumination light. The setting of the irradiation angle may be set stepwise in the range of the focal length of the photographing lens, for example, from 24 mm to 105 mm, or may be set steplessly.

  Next, the configuration of the pressure spring 24 in this embodiment will be described. FIG. 3 is an external view of the pressure spring 24. FIG. 4 is a partial cross-sectional view of the reflector umbrella holder 13 that houses the pressure spring 24. FIG. 5 is a schematic diagram showing a positional relationship between portions where the pressure spring 24 and the screw portion 22 are engaged. FIG. 6 is a schematic diagram illustrating a state in which the pressure spring 24 and the screw portion 22 are in contact with each other. FIG. 7 is a plan view of the storage groove 13d in which the pressure spring 24 is stored.

  FIG. 4 shows a cross section that is substantially orthogonal to the axial direction of the screw portion 22. Further, in FIG. 4, the configuration excluding the pressure spring 24 and the reflector holder 13 is omitted. Moreover, in FIG. 6, illustration of a cross-sectional pattern is omitted.

  As shown in FIG. 3, the pressure spring 24 is a molded part that is bent into a substantially U shape. The pressure spring 24 is configured by a metal member having a substantially circular cross section. The pressure spring 24 includes a first side part 24a, a second side part 24b, a third side part 24c, and a bent part 24d. The first side portion 24a is a portion that physically engages with the screw portion 22 in an elastically deformed state. The second side portion 24b is a portion where both ends thereof are fixed by screws 25a and 25b (see FIG. 2). The third side 24 c is a part for positioning the pressure spring 24 on the reflector holder 13. The bent part 24d is a part that connects the first side part 24a and the second side part 24b.

  As shown in FIG. 4, an insertion hole 13 e is formed in the storage groove 13 d of the reflector umbrella holder 13. When the pressure spring 24 is stored in the storage groove 13d of the reflector holder 13, the third side portion 24c is inserted into the insertion hole 13e. As a result, the pressure spring 24 is positioned on the reflector umbrella holder 13.

  Further, when the pressure spring 24 is housed in the housing groove 13d of the reflector holder 13 and both ends are fixed with screws 25a and 25b, the first spring 24 is engaged with the screw portion 22 in a state where the first side 24a is elastically deformed. To do. Thereby, the pressure spring 24 is fixed in a state where an appropriate biasing force is applied to the screw portion 22. The pressurizing spring 24 is engaged with the screw portion 22 at an angle in plan view so as to substantially coincide with the inclination angle of the thread formed on the screw portion 22.

  Further, as shown in FIG. 5, the pressurizing spring 24 engages with the screw portion 22 between the intermediate position P1 of the first side portion 24a and the position P2 of the bent portion 24d connected to the second side portion 24b. To do. In the present embodiment, the pressure spring 24 is engaged with the screw portion 22 at a position P1 intermediate the first side portion 24a.

  Further, as shown in FIG. 6, the pressurizing spring 24 is in contact with an inclined surface 22 a of a thread formed on the screw portion 22. If the pressure spring 24 is not in contact with the slope 22a of the screw thread but is in contact with the valley 22b of the screw thread, when the screw part 22 is rotated, rattling occurs in the pressure spring 24. End up. However, by causing the pressure spring 24 to come into contact with the inclined surface 22a of the thread, it is possible to prevent the pressure spring 24 from rattling when the screw portion 22 is rotated.

  Further, as shown in FIG. 7, a protruding portion 13f is formed on the side wall of the storage groove 13d. The protrusion 13f is a protrusion for forming a predetermined interval with the pressure spring 24 when the pressure spring 24 is stored in the storage groove 13d.

  In the present embodiment, the gap G between the pressure spring 24 and the protruding portion 13f is set to be 0.01 to 0.02 mm. The gap G only needs to be formed at least between the first side 24a of the pressure spring 24 and the protrusion 13f. When there is no gap G, when the screw portion 22 is rotated, the contact resistance between the screw thread of the screw portion 22 and the pressure spring 24 increases, and thus the light source unit 10 cannot be moved. In addition, when the gap G is larger than the above value, the pressure spring 24 is displaced in the axial direction of the screw portion 22 when the screw portion 22 is rotated. The spring 24 cannot be efficiently transmitted.

  On the other hand, when the gap G between the pressure spring 24 and the protrusion 13f is set to be 0.01 to 0.02 mm, when the screw portion 22 is rotated, the pressure spring 24 and the screw portion 22 A slight gap is created between the threads. Thereby, the contact resistance between the screw thread of the screw portion 22 and the pressure spring 24 is reduced, and the light source unit 10 can be moved smoothly. Further, since the pressure spring 24 does not shift in the axial direction of the screw portion 22, the light source unit 10 can be accurately positioned.

  Next, the operation of the pressure spring 24 in this embodiment will be described. 8A and 8B are schematic views showing the positional relationship between the pressure spring 24A and the screw portion 22 in the first comparative example. FIG. 9 is a schematic diagram illustrating a positional relationship between the pressure spring 24 </ b> B and the screw portion 22 in the second comparative example. FIG. 10 is a schematic diagram showing the positional relationship between the pressure spring 24 and the screw portion 22 in the present embodiment. In FIG. 8 and FIG. 9, the same reference numerals are given to the same parts as in the present embodiment.

  First, Comparative Example 1 will be described. As shown in FIG. 8A, the pressure spring 24A of Comparative Example 1 is formed in a rod shape without a bent portion. Also, one side of the pressure spring 24A is fixed to the reflector holder 13 (not shown) by a screw 25a. The other side of the pressure spring 24A is released.

  According to the configuration of Comparative Example 1, when a disturbance such as vibration or excessive driving resistance occurs in the light source unit 10 during the rotation of the screw portion 22, the pressure spring 24A is located above the screw portion 22 (arrow A). The pressure spring 24 </ b> A may be displaced in the axial direction of the screw portion 22. In this case, even if the rotation amount of the screw portion 22 is correctly controlled, the position where the pressure spring 24A engages with the screw thread of the screw portion 22 is shifted, so that the reflector holder 13 that engages with the pressure spring 24A. The (light source unit 10) cannot be moved to an accurate position.

  In Comparative Example 1, when the urging force applied to the screw portion 22 by the pressure spring 24A is increased, the frictional resistance at the engagement portion between the pressure spring 24A and the screw portion 22 increases. For this reason, in order to rotate the screw part 22 in which a large frictional resistance is generated, the motor 21 having a large output is required. Therefore, an increase in cost and an increase in size of the main body 2 are inevitable.

  Next, Comparative Example 2 will be described. As shown in FIG. 9, the pressure spring 24B of Comparative Example 2 is formed in a rod shape without bending. Further, both ends of the pressure spring 24B are fixed to the reflector umbrella holder 13 (not shown) by screws 25a and 25b.

  According to the configuration of Comparative Example 2, both end portions of the pressure spring 24B are fixed by screws 25a and 25b. Therefore, even when a disturbance such as vibration or excessive driving resistance occurs in the light source unit 10 during the rotation of the screw portion 22, the pressure spring 24B is lifted above the screw portion 22, and the pressure spring 24B is screwed. There is no deviation in the axial direction of the portion 22. Therefore, the reflecting umbrella holder 13 (light source unit 10) engaged with the pressure spring 24B can be moved to an accurate position by the rotational force of the screw portion 22.

  However, in the structure of the comparative example 2, the pressurizing spring 24B is engaged with the screw portion 22 without being elastically deformed. In this case, the frictional resistance changes greatly at the engagement portion between the pressure spring 24B and the screw portion 22 due to a slight difference in the urging force of the pressure spring 24B. For this reason, in the manufacturing stage, it is necessary to strictly adjust the interval between the pressure spring 24B and the screw portion 22 so that the urging force of the pressure spring 24B is optimized. It is also conceivable that the gap between the pressure spring 24B and the screw portion 22 is shifted due to vibration or the like. Therefore, in the structure of Comparative Example 2, productivity and reliability are lowered.

  Next, this embodiment will be described. In the structure of the present embodiment, as shown in FIG. 10, both end portions of the pressure spring 24 are fixed by screws 25a and 25b. For this reason, when the screw portion 22 rotates, even if a disturbance such as vibration or excessive driving resistance occurs in the light source unit 10, the second side portion 24 b of the pressure spring 24 is lifted above the screw portion 22. There is no. Therefore, it is possible to prevent the pressure spring 24 from shifting in the axial direction of the screw portion 22.

  Further, the pressure spring 24 is engaged with the screw portion 22 in a state where the first side portion 24a is elastically deformed in the direction A in the drawing. For this reason, even if the interval between the pressure spring 24 and the screw portion 22 is not strictly adjusted, an appropriate biasing force can be applied to the screw portion 22. Further, according to this, since it is not necessary to increase the urging force of the pressure spring 24 to the screw portion 22, it is possible to suppress an increase in frictional resistance at the engagement portion between the pressure spring 24 and the screw portion 22. .

According to the above-described embodiment, the following effects can be obtained.
(1) Since both ends of the pressure spring 24 are fixed, even if a disturbance or the like occurs when the screw portion 22 rotates, the pressure spring 24 may be lifted upward and shift in the axial direction of the screw portion 22. Absent. Therefore, according to the illuminating device 1 of this embodiment, the light source unit 10 can be accurately positioned without being affected by the occurrence of a disturbance or the like.
(2) In order to prevent the pressurizing spring 24 from being lifted upward, it is not necessary to increase the urging force applied to the screw portion 22 by the pressurizing spring 24. For this reason, the frictional resistance at the engagement portion between the pressure spring 24 and the screw portion 22 does not increase. Thus, since it is not necessary to rotate the screw part 22 in which a large frictional resistance is generated, it is not necessary to increase the output of the motor 21. Therefore, an increase in cost and an increase in size of the main body 2 can be avoided.
(3) The pressurizing spring 24 engages with the screw portion 22 in an elastically deformed state. For this reason, even if the interval between the pressure spring 24 and the screw portion 22 is not strictly adjusted, an appropriate biasing force can be applied to the screw portion 22. According to this, it is not necessary to strictly adjust the interval between the pressure spring 24 and the screw portion 22 so that the urging force of the pressure spring 24 is optimized in the manufacturing stage, resulting in a decrease in productivity. There is no. Further, since the gap between the pressure spring 24 and the screw portion 22 is not shifted due to vibration or the like, reliability is not lowered.
(4) The pressurizing spring 24 engages with the screw portion 22 between the middle position of the first side portion 24a and the position of the bent portion 24d connected to the second side portion 24b. According to this, since the pressurizing spring 24 is engaged with the screw portion 22 in an elastically deformed state, an appropriate biasing force can be applied to the screw portion 22.
(5) A projection 13 f is formed in the storage groove 13 d of the reflector holder 13. The pressurizing spring 24 is accommodated so that a predetermined interval is formed between the pressing portion 24 and the protruding portion 13f. According to this, when the screw portion 22 is rotated, a slight gap is generated between the pressure spring 24 and the screw thread of the screw portion 22. Contact resistance can be reduced. Therefore, the light source unit 10 can be moved smoothly. Further, since the pressure spring 24 does not shift in the axial direction of the screw portion 22, the light source unit 10 can be positioned accurately. Further, a projection 13f is provided on the side wall of the storage groove 13d, and the gap between the pressure spring 24 and the side wall of the storage groove 13d is adjusted by the projection 13f. According to this, even if the groove width of the storage groove 13d is not accurately formed, the gap with the pressure spring 24 can be adjusted appropriately by cutting the height of the protrusion 13f.
(6) The pressurizing spring 24 is in contact with a thread slope 22 a formed on the screw portion 22. For this reason, when the screw part 22 is rotated, it is possible to prevent the pressure spring 24 from rattling.
(7) The light source unit 10 is movably engaged along the guide bars 23 a and 23 b disposed substantially parallel to the screw portion 22. According to this, since the direction of the linear motion generated by the rotation of the screw portion 22 and the moving direction of the light source unit 10 substantially match, the rotational force generated by the motor 21 can be efficiently transmitted to the light source unit 10.
(Deformation)

Without being limited to the embodiment described above, the present invention can be variously modified and changed as described below, and these are also within the scope of the present invention.
(1) In this embodiment, the example which has arrange | positioned the guide bars 23a and 23b above the light source unit 10 was shown. Not only this but the guide bars 23a and 23b may be arrange | positioned under the light source unit 10. FIG. Further, the guide bar may be three or more.
(2) In this embodiment, the example which formed the protrusion part 13f in the side wall of the accommodation groove | channel 13d was shown. However, the present invention is not limited thereto, and a gap having a predetermined interval may be formed between the pressure spring 24 and the side wall of the storage groove 13d by accurately forming the groove width of the storage groove 13d.
(3) In the present embodiment, an example in which one pressure spring 24 is engaged with the screw portion 22 has been described. However, the present invention is not limited to this, and a plurality of pressure springs 24 may be engaged with the screw portion 22.
(4) The present invention can be applied not only to an external lighting device attached to a camera body but also to a lighting device with a built-in camera.

  Moreover, although the said embodiment and modification can be used in combination suitably, since the structure of each embodiment is clear by illustration and description, detailed description is abbreviate | omitted. Furthermore, the present invention is not limited by the embodiment described above.

  1: Lighting device, 2: Head part, 3: Main body part, 10: Light source unit, 13d: Storage groove, 21: Motor, 22: Screw part, 23a, 23b: Guide bar, 24: Pressure spring, 24a: No. 1 side, 24b: 2nd side

Claims (5)

A light source unit that emits illumination light;
Driving means for driving the light source unit along a predetermined direction;
Engagement means for physically engaging the light source unit and the drive means,
The drive means includes a motor that generates a rotational force, and a screw portion that extends in a predetermined direction and converts the rotational force generated by the motor into a linear motion in the predetermined direction,
The engagement means includes a pressure spring that transmits the linear motion of the screw portion to the light source unit,
The pressure spring includes a first side portion and a second side portion that are bent into a substantially U shape, and the first side portion is physically engaged with the screw portion in a state of being elastically deformed, Both ends of the second side portion are fixed to the light source unit. The lighting device according to claim 1.
The illuminating device according to claim 1, wherein the pressure spring engages with the screw portion between an intermediate position of the first side portion and a position connected to the second side portion. The lighting device according to claim 1 or 2,
Comprising a plurality of guide bars arranged substantially parallel to the threaded portion;
The illuminating device, wherein the light source unit is movably engaged along the plurality of guide bars. In the illuminating device as described in any one of Claims 1-3,
The light source unit includes a groove for storing the pressure spring,
The illumination device according to claim 1, wherein the pressurizing spring is accommodated so as to form a predetermined interval between the pressing spring and the side wall of the groove. In the illuminating device as described in any one of Claims 1-4,
The lighting device according to claim 1, wherein the pressure spring is in contact with a slope of a thread formed on the screw portion.

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