JP4539579B2 - Optical axis adjustment method of lamp device - Google Patents

Description

The present invention relates to a method of adjusting an optical axis in a lamp apparatus that houses a tube in which an electrode serving as a light emitting source is enclosed in a housing and performs efficient illumination using light reflected by a reflecting mirror formed on the inner surface of the housing. The lamp device of the present invention is used as a light source for a projector for image projection, or in a poor air environment such as an aircraft or a ship that navigates a poor environment such as a sandy desert or a sea containing salt. Applies to lighting.

In general, a lamp that generates illumination light in a light emitting region in a bulb by generating a discharge between opposing electrodes (discharge lamp) or heating a filament electrode (incandescent lamp) is widely used. ing.
In such a lamp device, an electrode for generating light is enclosed in a glass tube, and an external terminal for electrically connecting an external wiring for power supply and the electrode is provided on the tube. It is provided at the end.

  A general lamp device is configured such that a tube bulb in which an electrode serving as a light emitting source is enclosed is housed in a housing in a state of being open to the outside in order to promote heat dissipation of the tube bulb.

In a lamp device of a housing (open housing) where there is a place where air flows between the outside and the outside, the heat dissipation is excellent, but the atmosphere around the lamp device contains dust and corrosive substances (for example, salt). In this environment, the inside of the housing is contaminated and corroded, and there is a problem that the amount of light is attenuated and the product life is shortened. For example, Patent Document 1 and Patent Document 2 disclose a lamp device having a sealed structure.
JP 2004-79225 A JP 2001-101923 A

In the above-described open housing lamp device, since the tube is open to the outside, the operation of aligning (adjusting) the optical axis by positioning the tube relative to the housing is relatively easy.
On the other hand, in the lamp device having a completely sealed structure as described in Patent Document 1 and Patent Document 2, one end of the bulb is inserted into the support opening of the housing (reflector), and the opening inner peripheral surface and Since it has a structure that supports one end of the tube by filling an adhesive material (adhesive portion 29a in Patent Document 1 and cement 11 in Patent Document 2) in the gap with the outer peripheral surface of the tube, After the adhesive material is cured, the optical axis cannot be aligned. Therefore, it is necessary to adjust the tube to an appropriate position before filling and curing the adhesive material, but this is not easy. It was also very difficult to adjust the optical axis with high accuracy.

The present invention has a primary object to provide Te lamp device smell sealed structure confines light emitting area of the lamp in the housing, the optical axis adjusting method capable of performing good easily and accurately adjust the optical axis of the bulb And

In order to solve the above problems, the present invention takes the following technical means. That is, the method of adjusting the optical axis of the lamp device according to the present invention includes a lamp main body in which an electrode for generating illumination light is supported in a state of being enclosed in a bulb and an external terminal connected to the electrode is formed at the end of the bulb. And a reflective window that forms a sealed window hole for emitting illumination light from the light emitting area of the lamp body and a support opening for supporting the lamp body, and reflects the illumination light from the light emitting area to the window hole on the inner surface. An optical axis adjustment method for a lamp device including a housing formed with a lamp body, wherein a tube body end of a lamp body is passed through a support opening of the housing in a freely fitting state so that the position can be adjusted, and the tube body is formed outside the housing. A position adjustment mechanism that temporarily holds the exposed portion of the lamp is detachably attached to the housing, and a small positioning hole is formed in the housing to allow light to pass from the light emitting area of the lamp body. The target mark is placed outside the housing on the straight extension line connecting the ideal position and the positioning small hole, and the position adjustment mechanism so that the bright spot of the light beam passing through the small hole from the lamp body matches the target mark The lamp body is positioned by moving the lamp body with the position adjusting mechanism, and an adhesive material is placed in the gap between the inner peripheral surface of the support opening and the outer peripheral surface of the tube body while the lamp main body is temporarily held by the position adjusting mechanism. After filling and sealing the small positioning hole, the inside of the housing is hermetically sealed, and after the adhesive material filling the gap between the outer peripheral surface of the tube and the inner peripheral surface of the support opening of the housing is cured, the position adjusting mechanism is moved to the housing. It is intended to be removed from.

Here, the positioning small hole provided in the housing has a hole diameter that allows a spot-like bright spot to be formed on the target mark without diffusing the light of the lamp body that has passed through the small hole. It is preferable to provide a total of three positioning holes, one at two positions in a symmetric position and one in a direction perpendicular to the virtual straight line connecting the two small holes. Either one may be omitted. In addition, the target mark paired with the positioning small hole is preferably formed by a plus mark having an intersection on a flat screen.
The shape and number of support openings formed in the housing are not particularly limited, but the number of support openings is one (in the case of supporting the tube on one side) according to the shape of the tube and the number of support locations, Or two (in the case where the tube is supported on both sides).
The position adjustment mechanism that temporarily holds the exposed portion of the tube body is provided with a mechanism that can move and adjust the tube body in the vertical and forward / backward and tube tube axis directions while temporarily holding the tube body. It is preferable that the mechanism has four position adjusting screws that are pressed from four sides equally divided against the circumferential surface of the tube and an axial adjustment screw that is pressed in the axial direction of the tube from the end surface of the tube. .
The adhesive material may be welded (molten) glass, ceramic cement, or the like.

  According to this invention, the optical axis of the lamp body can be easily and accurately adjusted by positioning the lamp body by the position adjusting mechanism so that the bright spot of the light beam passing through the small hole from the lamp body matches the target mark. It can be carried out. In addition, after positioning the lamp body, with the position adjustment mechanism temporarily holding the lamp body, filling the adhesive material between the support opening of the housing and the outer peripheral surface of the bulb until it is cured Since it holds the lamp body, the position of the lamp body does not fluctuate when bonded with an adhesive material, and it can be securely fixed at an appropriate position, and the lamp device can be operated with optimized optical performance. There is an effect that it can be assembled.

(Means and effects for solving other problems)
In the above invention, the position adjusting mechanism includes four position adjusting screws that are pressed from four sides equally divided against the peripheral surface of the lamp body of the lamp body, and an axial adjustment that is pressed in the axial direction of the tube body from the end face of the tube body. It is preferable to have a configuration including a screw.
As a result, the lamp body can be easily and accurately moved to the ideal and most preferred position by moving the lamp body up and down, front and back with the position adjustment screw, and moving the lamp body in the axial direction of the bulb with the axial direction adjustment screw. Can be adjusted.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments described below, and it goes without saying that various aspects are included without departing from the spirit of the present invention.

  FIG. 1 is a schematic perspective view of a lamp device according to an embodiment of the present invention, and shows a state in which a position adjusting mechanism 30 for adjusting the position of a lamp body is attached to a housing 10, and FIG. FIG. 3 is a partial cross-sectional view of the lamp body, FIG. 3 shows a state where the support opening is glass-fused after adjusting the position of the lamp body, and FIG. 4 is a cross-sectional view of the assembled lamp device.

  The lamp device includes a body 12 having a window hole 11, a housing 10 composed of left and right side plates 13, a transparent glass plate 14 that hermetically seals the window hole 11, a tube 21 having rod-like regions on the left and right, and The lamp body 20 is composed of an electrode 22.

The housing 10 is formed into an airtight box-shaped block shape by assembling a body 12 made of an aluminum alloy and left and right side plates 13 using a packing 15 and screws 16.
A space for housing the lamp body 20 is formed inside the housing 10, and the mirror finish is made so that the inner wall surface 17 becomes a concave reflecting mirror.

A stop plate 18 is attached to the outer periphery of the plate glass 14 that seals the window hole 11 so as to overlap, and the stop plate 18 is fastened to the body 12 by using a packing 19 and a screw (not shown). The hole 11 is hermetically sealed.
The left and right side plates 13 are respectively formed with support openings 13a, through which the rod-shaped end portions of the tube 21 are penetrated. A gap in which the position of the lamp body 20 can be finely adjusted is provided between the support opening 13a and the bulb 21 of the lamp body 20, and the position of the lamp body 20 is adjusted by means described later. The inside of the housing is sealed by filling the gap with the adhesive material A.

  The lamp body 20 has a pair of electrodes 22 arranged in a straight line, and one end side of each electrode 22 is opposed to the center. The other end side of each electrode 22 is extended from the end of the tube 21 to the outside to become an external terminal 23.

  A position adjusting mechanism 30 that temporarily holds the exposed portion of the tube 21 is attached to the left and right outer sides of the housing 10 so as to be detachable from the housing. The position adjustment mechanism 30 includes a mechanism capable of moving and adjusting the tube 21 in the vertical and forward / backward and tube tube axis directions while temporarily holding the tube body 21 temporarily. In the present embodiment, the machine frame 32 detachably attached to the housing 10 with screws 31 is divided into four directions equally divided with respect to the peripheral surface of the lamp body 21 of the lamp body, that is, in the vertical and horizontal directions in FIG. Are provided with four position adjusting screws 33 and axial adjusting screws 34 pressed from the end face of the tube 21 in the axial direction of the tube. When the position adjusting mechanism 30 is attached to the housing 10, a hole 38 is provided in the machine casing 32 through which the external terminal 23 passes with a space so that the external terminal 23 extending outward from the tube body 21 does not get in the way. Yes.

  The housing 10 is provided with a small small hole 40 for positioning that allows light from the light emitting region of the lamp body 20 to pass therethrough. The positioning small holes 40 are two in a symmetrical position (front and rear side walls in FIG. 1) and one in a direction perpendicular to the imaginary straight line connecting the two small holes (upper wall in FIG. 1). It is preferable to provide a place, but it may be formed by omitting one of the small holes at the symmetrical position. Further, the target marks 41 are arranged on the extended lines of the straight line connecting the ideal position serving as the center point of the light emitting area of the lamp body 20 and the positioning small hole 40, respectively. In this embodiment, the target mark 41 is formed by a plus mark having an intersection on a flat screen 42.

  The positioning small hole 40 has a hole diameter so that the light of the lamp body 20 passing through the positioning small hole 40 does not diffuse and forms a dotted bright spot on the target mark 42. If the hole diameter is large, the bright spot becomes large and the positioning accuracy deteriorates. Therefore, it is preferable to make the hole diameter as small as possible. Further, the radiation side edge of the positioning small hole 40 is preferably formed in a trumpet shape as shown in the figure.

1 to 3 show an assembling process of the lamp device. The lamp main body 20 is temporarily held by adjusting screws 33 and 34 of the position adjusting mechanism 30 at the bulb portion exposed to the outside of the housing 10. Further, target marks 41 are respectively arranged on the extended lines of the straight line connecting the ideal position which is the center point of the light emitting area of the lamp body 20 and the positioning small hole 40. At this stage, the gap between the support opening 13a and the tube 21 is not welded.
In this state, the power source is connected to each external terminal 23 of the lamp body 20 to turn on the lamp body 20, and the luminous points of the light beams passing through the small holes 40 from the lamp body 20 are matched with the target marks 41. As described above, the adjustment screws 33 and 34 of the position adjustment mechanism 30 are screwed back and forth to move the lamp main body 20 up and down, front and rear, and in the axial direction. And it can adjust with sufficient precision.
After adjusting the position of the lamp body 20 to an appropriate position, the position of the lamp body 20 is held by the position adjusting mechanism 30, and a fused glass, ceramic cement, or the like is placed in the gap between the support opening 13a of the housing 10 and the tube 21. The inside of the housing 10 is hermetically sealed by filling the adhesive material A and filling the sealing small holes 40 with the adhesive material B similar to the adhesive material A and sealing the same. Then, after the adhesive material A filling the gap of the support opening 13a is cured, the position adjusting mechanism 30 is removed from the housing 10 to complete the lamp device shown in FIG. A gap as shown in FIG. 1 is provided in the machine frame 32 of the position adjusting mechanism 30 so that the work can be performed from the outside of the housing when the gap between the support opening 13a and the tube 21 is filled with the adhesive material A. Of course, is formed.

In this embodiment, the adhesive material B is used to seal the positioning small hole 40, but other means, for example, although not shown, the blind cover is hermetically sealed in the opening of the positioning small hole 40. You may make it seal by means, such as joining and fixing with a screw or an adhesive agent.

  The lamp device assembled as described above can set the optical axis of the lamp body 20 to an ideal position, and can optimize the optical performance. Further, as shown in FIG. 4, among the light irradiated from the light emitting region of the lamp body 20 (the gap where the electrodes of the counter electrode 22 face each other), the light L1 toward the window hole 11 is directly emitted from the window hole 11. In addition, the light L2 traveling toward the inner wall surface 17 is reflected by the concave reflecting mirror formed there and is emitted from the window hole 11.

  In the above embodiment, the target mark 41 formed on the screen 42 is used. Preferably, the screen 42 is made of a translucent material, and is magnified and observed from the opposite side. The positioning accuracy can be further improved by using auxiliary means such as calculating the center position of the bright spot by performing processing.

  Further, the reflecting surface formed on the inner wall surface 17 is not limited to an elliptical shape, and may be a parabolic shape, a planar shape, a polyhedral shape, or the like. Further, the window glass 14 may have a lens function.

  In general, the tube 21 of the lamp body 20 is substantially cylindrical. Therefore, when the position adjusting mechanism 30 presses and holds the outer peripheral surface of the tube body with the position adjustment screw 33 from four directions, the free rotation of the tube body 21 cannot be completely prevented. Therefore, another embodiment in consideration of this point is shown in FIG. 5, FIG. 6, and FIG.

  In this embodiment, a rectangular columnar sleeve 35 having a square cross section made of metal or glass or the like is welded to the end surface of the tube 21 with a welded glass or other adhesive material 36. In this case, as shown in FIG. 7, the vertical line Y in the ideal mounting posture of the lamp body 20 and the vertical surface 35 a of the prismatic sleeve 35 are made to be correctly parallel. Further, when the material of the sleeve 35 is glass, it is necessary that the external terminal 23 of the tube 21 passes through the hole 37 of the sleeve 35 and extends outward as shown in FIG. When the material of the sleeve 35 is a metal, it can form an external terminal as a conductor itself. Therefore, the external terminal 23 of the tubular body 21 may be embedded in the hole 37 of the sleeve 35 as shown in FIG. In the case where the sleeve 35 is made of metal, Kovar metal, super invar material, or the like with a low coefficient of thermal expansion for welding the tube material to glass is suitable. Further, the adhesive material 36 is bonded to the support opening 13a so that the welding portion between the sleeve 35 and the tube 21 does not come off due to heat generated when the gap between the support opening 13a and the tube 21 is welded. It is good to form it with a raw material higher than melting | fusing point of the conductive material A. Thereby, when welding the site | part of the support opening part 13a with the adhesive material A, it can prevent that the welding site | part of the sleeve 35 and the tubular body 21 softens, and positioning goes wrong.

  According to this embodiment, the sleeve 35 integrated with the tube 21 is pressed by the position adjusting screw 33 on the four sides, so that free rotation of the tube 21 is reliably prevented. Further, since the vertical line Y in the ideal mounting posture of the lamp body 20 and the vertical surface 35a of the prismatic sleeve 35 are mounted so as to be correctly parallel, only the four surfaces of the sleeve 35 are pressed by the position adjusting screw 33. Thus, the horizontal and vertical degrees of the tube 21 can be automatically adjusted. The tip of the position adjusting screw 33 is preferably an arc surface.

In the above-described embodiment, when the sleeve 35 is made of metal, Kovar metal, super invar material, or the like with a low coefficient of thermal expansion for welding the tube material to glass is suitable. Further, the melting point of the adhesive material A of the support opening 13a prevents the welding portion between the sleeve 35 and the tube 21 from being removed by the heat generated when the gap between the support opening 13a and the tube 21 is welded. It is good to form with the high adhesive material 36. FIG.

  The lamp device of the present invention is applied to a lighting device or the like. In particular, it is used as a light source for projectors for image projection, etc., or for lighting in poor air environments such as aircraft and ships navigating in poor environments such as sandy deserts and salty oceans. The

It is a schematic perspective view of the lamp device which is one embodiment of the present invention, and shows the state where the position adjustment mechanism for adjusting the position of the lamp body is attached to the housing. Sectional drawing of a part of lamp device in the said Example. In the said Example, the state which welded the support opening part after position adjustment of a lamp main body is shown. Sectional drawing of the lamp apparatus completed assembly. The partial perspective view which shows another Example of the position adjustment mechanism in this invention. The perspective view which shows the other example of the sleeve in the said Example. Sectional drawing which shows the state which hold | maintained the sleeve shown in FIG.5 and FIG.6 with the position adjustment screw.

Explanation of symbols

10: Housing 11: Window hole 12: Body 13: Side plate 13a: Support opening 14: Sheet glass 20: Lamp body 21: Tube 22: Electrode 23: External terminal 30: Position adjustment mechanism 32: Position adjustment screw 33: Axial direction Adjustment screw 40: Positioning small hole 41: Target mark 42: Screen A: Adhesive material B: Adhesive material

Claims (2)

A lamp body in which an external terminal that supports an electrode for generating illumination light in a state of being enclosed in a bulb and is electrically connected to the electrode is formed at the end of the bulb,
A sealed window hole that emits illumination light from the light emitting area of the lamp body and a support opening that supports the lamp body are formed, and a reflection surface that reflects the illumination light from the light emitting area to the window hole is formed on the inner surface. An optical axis adjusting method for a lamp device comprising a housing made of
A lamp body end of the lamp body is pierced through the support opening of the housing in a freely adjustable state, and a position adjustment mechanism for temporarily holding the exposed portion of the bulb outside the housing is detachably attached to the housing.
A small hole for positioning that allows passage of light from the light emitting area of the lamp body is formed in the housing,
A target mark is arranged outside the housing on an extended line of a straight line connecting the ideal position which is the center point of the light emitting area of the lamp body and the positioning hole,
The lamp body is positioned by moving the lamp body by the position adjustment mechanism so that the bright spot of the light beam passing through the small hole from the lamp body matches the target mark,
With the lamp body held by the position adjusting mechanism, the gap between the inner peripheral surface of the support opening of the housing and the outer peripheral surface of the bulb is filled with an adhesive material and the positioning hole is sealed to hermetically seal the interior of the housing. Stop,
A method of adjusting an optical axis of a lamp device, wherein the position adjusting mechanism is removed from the housing after the adhesive material filling the gap between the tube and the support opening of the housing is cured. The position adjusting mechanism includes four position adjusting screws that are pressed from four sides equally divided against the peripheral surface of the lamp body of the lamp body, and an axial adjustment screw that is pressed in the axial direction of the tube body from the end face of the tube body. The method of adjusting an optical axis of a lamp device according to claim 1 .

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