HU183426B - Projecting lamp consisting of incandescent lamp and condensor mirror mounted rigidly to the lamp - Google Patents

Abstract

The invention relates to a projection lamp consisting of an incandescent lamp and a substage reflector forming a structural unit with the latter, in which the reflector has a continuous curved surface and the incandescent lamp is a halogen lamp provided with an independent bulb, the filament axis of the incandescent element of the halogen incandescent lamp coinciding with the plane of symmetry of the reflector. The essence of the invention is that the quotient of the diameter of the film gate, measured at an angle of a selected reference plane, with the axis of the film gate and of the diameter of the filaments at the same angle - in the range of phi = 0...360 DEG - the following relationship holds for the lowest values of (Dk/Ds)min and for the highest values of (Dk/Ds)max: <IMAGE> where m is the lesser edge length (height) and s the greater edge length (width) of the film gate. <IMAGE>

Description

(57) EXTRAS

BACKGROUND OF THE INVENTION The present invention relates to a projection lamp consisting of an incandescent lamp and a condenser mirror forming a rigidly integrated unit in which the mirror has a continuous curved surface and the incandescent lamp is a self-contained halogen incandescent lamp having its helical axis Dk is the diameter and the helix angle φ measured for the same angle D _and the diameter D _s / D _s = φ divided by the 0th . . Minimum (D _k / / D _s) resulting from the 360 ° range ir _m ·? for a maximum _inax (D _k , / D _s ) of

ms <(D _k / D _s ) _mjn : (D _k / D _s ) _{m; ix} % 1 condition where ni is the smaller edge (height) of the film gate and its greater edge (width).

183 42η

The present invention relates to a projection lamp consisting of an incandescent lamp and thus a condenser lamp forming a structural unit.

The use of condenser mirrors in projection lamps has long been known and serves two purposes: to provide as much of the light output from the filament as possible into the plane of the film gate and to provide even illumination in this plane. Generally, it is not possible to construct a design that achieves the absolute optimization of these two requirements at the same time, but only some optimal trade-off.

In the past, there were designs in which the bulb body of the filament lamp and the condenser mirror were housed in a common bulb; however, this is not possible with halogen incandescent lamps because the surface of the mirror would be corroded under the conditions of the halogen cycle. Thus, current modem designs consist of a mirror bulb and a halogen incandescent lamp fixed to the mirror but having a separate bulb, the latter incandescent body being located in a axis of symmetry of the mirror. (A symmetry axis is defined as a line defined by intersecting at least two symmetry planes of a spatial surface.)

The mirror surface is, for most of the presently known designs, a surface of continuous curvature, namely a rotational surface (its axis of rotation is the axis of mirror symmetry). The exception is General Electric's Multi-Mirror system, where the mirror fits from discrete flat surfaces, but it is extremely complicated and expensive to produce.

As the bulb body of the halogen filament lamp, the presently known designs, without exception, employ a circular cylindrical helix whose axis is either perpendicular to or coincident with the axis of rotation of the rotating surface defining the mirror. In the latter case, application no. According to the Dutch patent, it is advisable to choose a cylinder length to diameter ratio of not more than 2: 1.

More particularly, the present invention relates to a projection lamp consisting of an incandescent lamp and a condenser mirror forming a rigid assembly thereof, in which the mirror has a continuous curved surface, and the incandescent lamp is a self-incandescent halogen incandescent lamp which is .

The present invention is based on the discovery that in structures having a mirror rotating surface and a halogen filament lamp body having a cylindrical spiral having a circular cross-section having an axis perpendicular to the axis of rotation, the luminous flux density is perpendicular to the axis, which is inconsistent with the uniform illumination of the rectangular cross-sectional film gate, and consequently is an obstacle to the approximation of the optimal compromise mentioned in the introduction.

It is an object of the present invention to eliminate this circumstance and thereby to improve the structures known hitherto to facilitate both the proportion of luminous flux passing through the film gate plane and the uniformity of the film gate illumination with respect to the same luminous flux exiting the bulb.

According to the present invention, the object of the present invention is to select the shape of the spiral cross-section of the mirror coincident with the axis of symmetry, so that the ratio of its diameter measured relative to the angle enclosed by a selected reference plane is less than In the case.

Accordingly, the present invention relates to a projection lamp consisting of an incandescent lamp and a condenser mirror forming a rigid assembly thereof, wherein the mirror has a continuous curved surface, and the incandescent lamp is a halo incandescent lamp having its own and satisfies the following condition:

m: s <(Dk / Ds) _m i _n : (Dk / Ds) _max <1, where dk the diameter of the film gate, measured at an angle ψ with the reference plane containing the axis, ds the diameter of the spiral measured at the same angle φ, m the height or smaller edge of the film gate, s the width or greater edge of the film gate, (Dk / Ds) _m j _n is the quotient of the film gate and the spiral diameter at the same angle φ 1, where this quotient gives a minimum value,

(Dk / Ds) _{max is} the quotient of the film gate diameter of the helix at the same angle φ 2, where this quotient gives the maximum value.

The present invention is illustrated in more detail by means of the drawings.

Figure 1: Conventionally constructed film gate and spiral projection.

Figure 2 illustrates the structure of Figure 1

Dk / Ds as a function of angle φ.

Figure 3: Construction of the invention in a "race track" spiral.

Figure 4: Part of the construction of Figure 3

Dk / Ds as a function of angle φ.

Figure 5 is a perspective view of an idealized embodiment of an embodiment of the invention.

FIG. 6: Referring to the construction of FIG. 5

Dk / Ds as a function of angle φ. For the purpose of understanding the present invention, Figure 1 first shows an arrangement according to prior art constructions. You can see the axis view of the film gate 1, its height m in this example being proportional to the width s as in the standard 16 mm narrow film projectors, where m = 7 mm, s = 9.6 mm. A spiral image of a circular cross-section is drawn here. In our example, the spiral diameter is D _s = 1.88 mm. If the reference plane is chosen to be horizontal, the angle ezzel corresponding to it is the diameter Dj of the film gate.

The graph in Fig. 2 shows the ratio Du'D _{s as a} function of angle φ; as can be seen, this ratio ranges from 3.72 to 6.32, (D 1 / D _s ) _m j _n : (D k / D _s ) _max ⁼ 3.72: 6.32 = 0.59: 1.

An application of the basic idea of the present invention is shown in Figure 3. Here, the cross-section of the spiral 3 has been changed to a "racetrack" so that the ratio of the vertical and horizontal diameter of the spiral with the same circumference, i.e., at the same bulb length, at the first approximation, is equal to the film gate height.

183,426 and its width ratio. In our example, this is true if the vertical diameter is 1.52 mm and the horizontal diameter is 2.08 mm.

Figure 4 shows the D _k / D _s ratio of this construct as a function of φ; it varies between 4.61 and 6.14, 5 (D _s / D _{s) min: (D)} D _{s) max} = 4.61: 6.14 = 0.75: 1st

The embodiment of the most consistent implementation of the basic idea of the present invention is shown in Figure 5.

Here, the spiral cross-section of the 4 is a rectangle with an aspect ratio similar to that of a film screen. (This is, of course, an idealized image that can only be approached with a spiral of finite thickness wire.) Here, the spiral circumference is the same as in the cases discussed above, resulting in a rectangular cross-section of 1.24 mm in height and 1.71 mm in width. 15

Figure 6 shows the inherent fact of the arrangement that in this case, regardless of the value of _k , D _k / D _s = 5.63 constant and thus (D _k / D _s ) _min : (D _k / D _s ) _max = 1: first

The improvement achieved by the application of the present invention will depend upon the particular geometrical conditions. When used in the case described in this example, a rotating ellipsoid mirror and a 12 V / 100 W projection lamp having a spiral length of 2.3 mm e.g. the average illumination measured in accordance with DIN 15748 and its uniformity could be increased by about 15% 25 by changing the spiral cross-section to a rectangular shape. The same result was obtained by numerically calculating the illumination distributions.

Claims (2)

Patent claims A projection lamp consisting of an incandescent lamp and a condenser mirror forming a rigid assembly thereof, wherein the mirror has a continuous curved surface and the incandescent lamp is a single-incandescent halogen filament lamp having a helical axis coinciding with the axis of the filament, has a spiral (3,4) cross-section other than circular cross-section and satisfies the following condition: m: s <(Dk / Ds) _m j _n : (Dk / Ds) _max <1 where dk Ds m s (Dk / Ds) _m i _n (Dk / Ds) _{max is} the diameter of the film gate (1) measured at an angle φ with the reference plane containing the axis, the diameter of the helix (3, 4) measured at the same angle,, height of the film gate or less, the width of the film gate (1) or the greater length of the film gate (1) is the quotient of the diameter of the film gate (1) and the spiral (3, 4) at the same angle φ 1, where 3, 4) is the quotient of the diameter of the same angle φ 2, where this quotient gives the maximum value. 6 pieces of figure Responsible publisher: Zoltán Himer Head of Department Published by Technical Publisher 86 071. UNIPROP -3183426 NSO ₃ : Η 01 V 7/02 Figure 2