JP2001160304A - Lamp with reflector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp equipped with a miniature reflector which has high efficiency of utilizing light and in which heat problem has been solved as well. SOLUTION: This lamp (A) with a reflector has been constituted with (a) a concave reflecting mirror (1), a reflector (3) having a lamp fixture (2) at the center of the mirror (1), and a lamp body (4) mounted on the above fixture (2), and with (b) an opening-side reflector (7) composed of a base-side reflector portion 6 that reflects both of light emitted from the hemispherical part at the lamp fixture side (2) of the bulb part (5) of the lamp body (4), and an opening-side reflector (7) that focuses light emitted from the hemispherical part at the opening side of the above lamp body (4) and reflected light of the base-side reflector portion (6) at the front of the concave reflecting mirror (1).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp with a reflector, which improves the efficiency of light utilization by the reflector and at the same time solves the problem of heat of the reflector.

[0002]

2. Description of the Related Art In recent years, the miniaturization of light sources for projectors (lamp with reflector) is rapidly progressing, and the demand for further miniaturization is increasing more than ever.
However, due to the downsizing of the light source for projectors, (a) reduction in light utilization, (b) destruction of the seal of the lamp body, (c) reduction in lamp life, and (d) damage due to the thermal influence of the reflector Numerous problems have arisen. Hereinafter, the problems will be described based on actual examples.

[Conventional Example 1] As shown in FIG. 2, the reflecting surface (31a) of the concave reflecting mirror portion (31) of the conventional reflector (33) is 2
It is composed of a simple rotating paraboloid or a rotating semi-ellipsoid having two focal points (a focal point in the reflecting surface is a first focal point (f1), and a focal point in front of the reflecting surface is a second focal point (f2)). Was. This point is the same in Conventional Examples 2 and 3 (B2, 3). Hereinafter, Conventional Example 1 (B
The reflection surface (31a) of the reflector (33) of (1) will be described as a semi-ellipsoid of revolution. Reflection surface (31a) of reflector (33) of Conventional Example 1
The diameter of the spherical part (35) of the lamp body (34) attached to the lamp mounting part (32) of the reflector (33) is 9 mm in diameter, the diameter of which is 29 mm, the major diameter is 18.5 mm, and the minor diameter is 14.5 mm. The diameter of the seals (36) and (37) formed by
0 mm, the spherical portion (35) of the lamp body (34) is aligned with the first focal point (f1) of the reflecting surface (31a), and the lamp body (34) is
When fixed to the lamp mounting portion (32) of (3), the light of the optical path (a-1) emitted from the spherical portion (35) shown in FIG. 2 is reflected by the reflecting surface (31a) of the reflector (33), Take (a-2). But this light path
(a-2) does not reach the second focal point (f2) because it is blocked by the thick and long seal portion (36) of the lamp body (34) as shown by a dotted line from the middle,
The light is not used directly.

[0004] Another optical path (b-
The light of (1) is reflected by the reflecting surface (31a) of the reflector (33) and is reflected on the optical path.
Take (b-2). However, this optical path (b-2) hits the spherical part (35) of the lamp body (34) itself, and is refracted inward by the spherical part (35) and enters the spherical part (35). ), A predetermined second portion in front of the concave reflecting mirror portion (31).
The light does not reach the focal point (f2) and is not effectively used.

In other words, of the light reflected from the reflecting surface (31a) by the light emitted from the light emitting point (p) of the spherical portion (35), the second focal point (f)
The light that reaches directly to 2) and is effectively used is the second focal point (f2)
And an extension (La) of a line connecting the tip of the seal portion (36) and the light-emitting point (p).
Of the lines reaching (2), the light is limited to light that is reflected by the reflection surface (31a) and passes through a range defined by the line (Lb) reaching the second focal point (f2) (portion indicated by the intersection line). Will be done. The point reflected by the reflection surface (31a) is defined as (r).

In terms of the spherical portion (35), the intersection (q) between the extension (La) and the concave reflecting mirror (31) and the light emitting point of the spherical portion (35)
(p), a line (Ld) connecting the above (r) and the light emitting point (p) of the spherical portion (35), and a range surrounded by the spherical portion (35) (intersecting line (A portion indicated by a circle)). As can be seen from the figure, the light directly used is about half of the light emitted from the spherical portion (35), and the light utilization is very poor.

[Conventional example 2] Therefore, as shown in FIG. 3, the reflector used in FIG.
In the lamp mounting part (32) of (33), the spherical part (35) has a diameter of 9 mm,
A lamp body (34a) having a short opening-side seal portion (36a) having a diameter of 6 mm and a length of 8.8 mm on one side of the seal portion (36a) (37) formed by shrinking was similarly mounted. When the opening-side seal portion (36a) is shortened in this way, the area blocked by the opening-side seal portion (36a) is reduced, and the portion where light is effectively used (the region indicated by the intersection line) is enlarged. Utilization rate is greatly improved. However, when the length of the opening-side seal portion (36a) is reduced, the temperature of the opening-side seal portion (36a) rises due to approaching the sphere portion (35) which becomes hot at the time of lighting. Since the temperature reaches 700 degrees, the opening side seal part in only 200 hours
(36a) was destroyed, and the lamp life was extremely shortened.

[Conventional example 3 (B3)] In addition, in order to improve the light utilization rate, as shown in FIG. 3, the same reflector (33) as the conventional example 1 (B1) is provided with the diameter of the spherical portion (35b). Is 7 mm, the diameter of the seal part (36b) formed by shrink is 6 mm, and the length is
The sphere part (35b) of 10mm is one more small lamp body
(34b) was mounted as described above. Also in this case, as in the conventional example 2 (B2), the area blocked by the seal portion (36b) was reduced, and the light utilization rate was greatly improved.

However, the spherical part of the lamp body (34b)
Reducing the size of (35b) reduces the tube wall temperature of the spherical part (35b) by 12
When the temperature was raised to 50 ° C., the spherical portion (35b) was devitrified, and the light amount was reduced to 50% or less in only 200 hours, resulting in a problem that the lamp life was extremely shortened.

As can be said in common with the first to third prior arts, the miniaturization of the lamps with reflectors (B1 to B3) requires the first focal point (f1) of the reflector (33) and the reflecting surface (31a). Means closer. In the above example, the lamp bodies (34) (34a) (34
The distance between b) and the reflective surface (31a) is only 1.16mm,
As a result, when the lamps (34), (34a) and (34b) are turned on, the concave reflecting mirror portion (31) is greatly affected by the heat of the spherical portions (35), (35a) and (35b) and rises to around 700 ° C. And cracks and peeling of the reflection film (38) occurred. In order to prevent the reflector (33) from cracking and the reflection film from peeling, the temperature must be 500 ° C. or lower.

[0011]

The problem to be solved by the present invention is as follows.
It is an object of the present invention to develop a reflector-equipped lamp having an ultra-small reflector having a high light utilization efficiency and solving a heat problem.

[0012]

[Claim 1] A lamp with a reflector (A) comprises: (a) a concave reflecting mirror (1) and a lamp mounting part (2) at the center of the concave reflecting mirror (1); And a lamp body attached to the lamp mounting portion (2).
(4) lamp with reflector (A),
(b) the concave reflecting mirror portion (1) is a lamp mounting portion of a spherical portion (5) of a lamp body (4) mounted on a lamp mounting portion (2);
The light emitted from the hemispherical portion on the (2) side, the base-side reflecting portion (6) reflecting toward the spherical portion (5), and the light emitted from the opening-side hemispherical portion of the lamp body (4) and the light And an aperture-side reflector (7) for condensing the light reflected by the base-side reflector (6) in front of the concave reflector (1).

According to this, the base-side reflecting portion (6)
The light emitted from the hemispherical portion of the spherical portion (5) of the lamp body (4) on the lamp mounting portion (2) side can be reflected toward the spherical portion (5), and this reflected light is reflected by the lamp body (4). ) Is reflected by the aperture-side reflector (7) together with the light emitted from the aperture-side hemisphere part, and is collected in front of the concave reflecting mirror (1). 2) The light emitted from the hemisphere on the side could be used effectively, and the light utilization rate could be greatly improved.

Further, the base-side reflector (6) allows a sufficiently large gap to be formed between the lamp body (4) and the base-side reflector (6), thereby reducing the size of the lamp with reflector (A). The reflection film (8) of the base side reflection part (6) by the heat when the lamp body (4) is turned on
Can be prevented from peeling off or cracking of the reflector (3).

The lamp with the reflector according to claim 2 (A)
The (a) concave reflecting mirror (1) and the concave reflecting mirror (1)
A reflector (3) having a reflector (3) having a lamp mounting part (2) at the center thereof and a lamp body (4) mounted on the lamp mounting part (2), b) The concave reflecting mirror part (1) is composed of a base-side reflecting part (6) formed around the lamp mounting part (2) and an opening-side reflecting part (7) provided on the opening side. (C) a rotating semi-elliptical surface or a rotating surface in which the base-side reflecting portion (6) is formed in a hemispherical shape and the opening-side reflecting portion (7) is connected to the opening end of the hemispherical base-side reflecting portion (6). It is characterized by being formed by a paraboloid.

Here, the specific shapes of the base-side reflecting portion (6) and the opening-side reflecting portion (7) constituting the concave reflecting mirror portion (1) are shown, and the base-side reflecting portion (6) is hemispherical. The sphere
Light emitted from the hemispherical portion on the lamp mounting portion (2) side of (5) can be reflected toward the spherical portion (5), and this reflected light can be reflected from the opening side hemispherical portion of the lamp body (4). The emitted light is reflected by the aperture-side reflecting portion (7), and can be collected in front of the concave reflecting mirror portion (1). As a result, the light emitted from the hemisphere on the side of the lamp mounting part (2), which has been difficult to use, can be effectively used, and the light utilization rate can be greatly improved.

Further, as described above, the base-side reflecting portion (6)
, A sufficiently large gap can be created between the lamp body (4) and the base side reflector (6), and the lamp with reflector
The peeling of the reflection film (8) and the occurrence of cracks can be prevented even by the influence of heat when the (A) is miniaturized.

According to a third aspect of the present invention, there is provided a lamp with a reflector according to the present invention.
The first focal point (F1) of (6) is set to the light emitting point (P) of the spherical portion (5) of the lamp body (4) attached to the lamp attachment portion (2). "

By doing so, of the light emitted from the light emitting point (P), the light passing through the base-side hemisphere portion is reflected by the base-side reflection portion.
The light is reflected by (6), returns to the light emitting point (P), and further passes through the light emitting point (P) to reach the aperture-side reflecting portion (7). And here the lamp body
(4) Open-side reflector (7) with light emitted from the open-side hemisphere portion
The light is reflected by and condensed in front of the concave reflecting mirror (1). As a result, the light emitted from the hemisphere on the side of the lamp mounting part (2), which has been difficult to use, can be effectively used, and the light utilization rate can be greatly improved.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. The reflector-equipped lamp (A) of the present invention includes a reflector (3) having a concave reflecting mirror (1) and a lamp mounting part (2) at the center of the concave reflecting mirror (1), and the lamp mounting part (2). ) And a lamp body (4). The concave reflecting mirror section (1) includes a base-side reflecting section (6) formed around the lamp mounting section (2) and an opening-side reflecting section (7) provided on the opening side. ing.

The base-side reflecting portion (6) is formed in a hemispherical shape, and the opening-side reflecting portion (7) is formed on a rotating semi-elliptical surface or a paraboloid of revolution connected to the opening end of the hemispherical base-side reflecting portion (6). It is formed. At the center of the base-side reflector (6), a lamp mounting part (2) protruding rearward is formed, and on the inner peripheral surfaces of the base-side reflector (6) and the opening-side reflector (7). A reflection film (8) formed by plating or vapor deposition and a selective transmission film (not shown) for transmitting most infrared rays to the back and mainly reflecting visible light to the front are formed.

Here, the focal point of the base-side reflecting section (6) is a first focal point (F1), and the focal point of the aperture-side reflecting section (7) is a second focal point (F2). In this embodiment, the first focal point (F1) is located at the center of the opening of the base-side reflecting section (6). (Of course, the first focal point (F1) may be slightly inside or slightly outside the opening of the base-side reflecting portion (6).) The lamp body (4) is This is a discharge lamp such as a two-port type metal halide lamp, which has a spherical portion (5) at the center and seal portions (9a) (9b) provided on both sides thereof. Seal part (9
a) (9b) can be formed by heating and shrinking the portion of the glass tube serving as the seal portion (9a) (9b) from the outside, or by forming the heated portion by pinching. Yes, any case may be used, but in this case, a material formed by shrinking is a representative example.

Molybdenum metal foil is provided in the sealing portions (9a) and (9b).
(10) are respectively buried, said molybdenum metal foil
The end of the shaft (12) of the electrode (11) and one end of the external lead rod (13) are welded to (10). The electrodes (11) protrude from the sealing portions (9a) and (9b) into the interior of the spherical portion (5) and are opposed to each other with a slight space therebetween. An electric arc is generated during (11) to generate strong bright light. This portion is represented by a light emitting point (P). The sphere portion (5) is filled with necessary gas and required metal.

One of the sealing portions (9a) (9) of the lamp body (4)
b) is inserted into the lamp mounting part (2) of the reflector (3) so that the light emitting point (P) and the first focal point (F1) of the base-side reflecting part (6) coincide with each other. The lamp body (4) is fixed to the reflector (3) by fixing with the agent. In this case, since the reflector (3) has a hemispherical base-side reflecting portion (6), the light emitting point of the lamp body (4) is located at the first focal point (F1) of the base-side reflecting portion (6).
When (P) is aligned and fixed, the space between the outer peripheral surface of the spherical portion (5) and the reflective surface (6a), which is the inner peripheral surface of the base-side reflector (6), is uniform and sufficient over the entire surface. You will keep the distance.

Next, the operation of the present invention will be described. When a voltage is applied between the electrodes (11) to generate an arc, strong bright light is generated between the electrodes (11). Of this light, the light emitting point (P), the hemispherical part on the base side of the spherical part (5) and the base side seal part (9b)
The light within the range of a line (L1) connecting the boundary point (X1) and a line (L2) connecting the light-emitting point (P) and the opening end (Y) of the base-side reflecting portion (6) is located on the base side. The light is reflected by the reflecting surface (6a) of the reflecting portion (6), returns to the light emitting point (P), further penetrates through the light emitting point (P), and reaches the reflecting surface (7a) of the opening-side reflecting portion (7). When the reflection point, which is the intersection of the extension of the line (L1) and the reflection surface (7a) of the aperture-side reflection section (7), is represented by (Z), the line
The light reflected between (L1) and (L2) is reflected between the reflection point (Z) and the point (Y), and proceeds to the second focal point (F2). As described above, all the light emitted from the effective portion (the portion other than the seal portion (9b)) of the base-side hemisphere portion is reflected by the base-side reflecting portion (6) and is effectively used.

On the other hand, the hemispherical portion on the opening side and the sealing portion on the opening side
The light within the range of the line (L3) connecting the boundary point (X2) of (9a) and the line (L2) connecting the light emitting point (P) and the opening end (Y) of the base-side reflector (6) is The light is directly reflected by the reflection surface (7a) of the aperture-side reflection portion (7) and proceeds to the second focal point (F2). In this way, all the light emitted from the effective portion (the portion other than the seal portion (9a)) of the hemispherical portion on the opening side is also effectively used.

The first focal point of the hemispherical base-side reflector (6)
Since the lamp body (4) is installed in conformity with (F1), the spherical part of the lamp body (4) extends over the entire surface of the base-side reflector (6).
A sufficiently large gap can be created with the outer peripheral surface of (5),
The surface temperature of the base-side reflector (6) as well as the aperture-side reflector (7)
Lamp with reflector (A) that can be reduced to 500 ° C or less
To prevent the reflective film (8) of the base-side reflector (6) from peeling off or cracking of the reflector (3) due to the heat generated when the lamp body (4) is turned on. Can be done.

Example: 35 mm diameter, 18.5 mm long diameter, 1 short diameter
Following the 4.5 mm spheroidal aperture-side reflector (7), a 8.9 mm aperture hemispherical base-side reflector (6) centered on the first focal point (F1) is integrated in the center ( (Reflection surfaces (6a) and (7a) are discontinuous at the boundaries) Prepare a reflector (3) formed, the diameter of the spherical portion (5) is 9 mm, and the seal portions (9a) and (9b) formed by shrinkage The lamp body (4) having a diameter of 6 mm and a length of 20 mm was mounted so that its light emitting point (P) coincided with the first focal point (F1).

In FIG. 1, the light path (c-1) of the light emitted from the light emitting point (P) is different from the light path (c-1) by the reflecting surface (6a) of the hemispherical base-side reflecting portion (6). It is reflected on the same optical path. Since the reflected light is the same as the outgoing optical path (c-1), it passes through the spherical portion (5) without refraction, and passes through the elliptical reflecting surface (7) of the aperture-side reflecting portion (7).
a) reaches the point (c) on which the light path (c-
2), and reaches the second focal point (F2) without being blocked by the seal portion (36) as in Conventional Example 1. Therefore, it was possible to increase the light utilization rate without shortening the sealing portion (9a) on the opening side. Also, in this case, the temperature of the reflector (3) [particularly, the base-side reflecting portion (6)] becomes 400 ° C. or less, which can solve thermal problems such as peeling of the reflecting film (8) and cracking of the reflector (3). done.

As a result, in the case of the above embodiment, it was possible to increase the light utilization rate by 15% as a whole. Furthermore, compared to Conventional Example 2, 2000 hours were achieved for a 200-hour life, and Conventional Example 3 had a 200% maintenance rate attenuated to 50% (attenuation rate was 50%). On the other hand, in the present embodiment, the maintenance rate of the light amount could be stopped at 70% (the attenuation rate was 30%) in 2000 hours.

[0031]

According to the present invention, the concave reflecting mirror portion of the reflector of the lamp with the reflector includes a hemispherical base-side reflecting portion and an opening-side reflecting portion formed by a rotating semi-elliptical surface or a paraboloid of revolution. Since the light is emitted from the base-side hemispherical portion of the spherical portion of the lamp body, the light is reflected by the hemispherical base-side reflecting portion in the opposite direction to the emission optical path, enters the opening-side reflecting portion, and With the light coming out of the hemispherical part on the opening side of the body, the light is reflected by the opening-side reflecting part, and can be condensed at the second focal point in front of the concave reflecting mirror part. The light emitted from the hemisphere can be used effectively, and the light utilization rate can be greatly improved even if the size of the lamp with reflector is reduced.

Further, by providing the hemispherical base-side reflecting portion, it is possible to provide a sufficient space between the spherical portion of the lamp body and the hemispherical base-side reflecting portion, thereby suppressing the influence of heat during lighting. Is now available.

[Brief description of the drawings]

FIG. 1 is a sectional view of a lamp with a reflector according to the present invention.

FIG. 2 is a sectional view of a lamp with a reflector according to Conventional Example 1.

FIG. 3 is a cross-sectional view of a lamp with a reflector according to Conventional Example 2.

FIG. 4 is a sectional view of a lamp with a reflector according to Conventional Example 3;

[Explanation of symbols]

 (A) Lamp with reflector (1) Concave reflector (2) Lamp mounting part (3) Reflector (4) Lamp body (5) Spherical part (6) Base-side reflector (7) Open-side reflector (8) Reflective film

Claims (3)

[Claims] 1. A reflector-equipped lamp comprising: a concave reflecting mirror portion; a reflector having a lamp mounting portion at the center of the concave reflecting mirror portion; and a lamp body attached to the lamp mounting portion. A reflecting mirror configured to reflect light emitted from a hemispherical portion of the sphere portion of the lamp body attached to the lamp mounting portion on the lamp mounting portion side toward the spherical portion; and an opening of the lamp body. A lamp with a reflector, comprising: a light emitted from a side hemispherical portion and a light reflected by the base-side reflecting portion, which are focused in front of a concave reflecting mirror portion. 2. A lamp with a reflector comprising: a concave reflecting mirror portion; a reflector having a lamp mounting portion at the center of the concave reflecting mirror portion; and a lamp body attached to the lamp mounting portion; The mirror portion is composed of a base-side reflecting portion formed around the lamp mounting portion and an opening-side reflecting portion provided on the opening side. The base-side reflecting portion is formed in a hemispherical shape, and A reflector-equipped lamp, wherein the reflector is formed as a semi-ellipsoid of revolution or a paraboloid of revolution connected to the opening end of the reflector on the hemispherical base side. 3. The lamp with a reflector according to claim 1, wherein a focal point of the base-side reflecting portion is set to a light emitting point of a spherical portion of the lamp body attached to the lamp attaching portion.