JPS647442B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lighting device, and in particular to an object-oriented lighting device. More specifically, a screen or a baffle is arranged to completely or partially block the light rays from the light source that illuminate the workpiece at a predetermined position and that are at an angle that causes a veil reflection at the observation point. The present invention relates to a task-oriented lighting device equipped with a task-oriented lighting device.

[Conventional technology and problems to be solved]

Light rays from a light source, such as a desk lamp or elongated light fixture, illuminating a "task" placed horizontally on a desk surface are reflected at an angle that corresponds to the angle of incidence. Such reflections toward the viewer's eyes reduce the contrast between bright and dark areas of the workpiece (eg, a white page and dark type printed on it). This kind of reflection is called a "veiling reflection."

In order to reduce or eliminate veil reflection, conventional measures have been taken to place a lens below the light source that is designed to refract rays of light in equal proportions laterally; It still receives a reduced but still sufficient amount of light. Although such a configuration has some advantages,
There was a problem in that some veil reflection remained in all vertical planes including the work object, the observer's eye, and part of the light source.

No. 3,389,246, filed June 18, 1968, by the present applicant, a combination desk, bulkhead, and lighting system is disclosed. The lighting device includes a fluorescent lamp, upper and lower beam conditioners, and has a rectangular grid-like butthole for directing the beam vertically upward toward the ceiling and downward toward the desk surface. are doing. However, because of the horizontal area apertures in the lower grid, even though all direct rays are removed, the rays strike the workpiece on the tabletop at an angle that creates a veiled reflection in the observer's eyes. I reach it.

It is therefore an object of the present invention to provide a lighting device comprising an elongated light source and a screen or baffle arranged to block the light rays from reaching the workpiece along the light path so as to create veil reflections. It is. The position of the observer, whether constant or variable, should be considered as a factor in determining the size and adjustability of the screen or buttful.

Another object of the invention is to provide a screen or baffle assembly suitable for mounting in operative association with any standard light source.

Yet another object of the present invention is to block only those rays that cause veil reflection, while allowing complete illumination of the object by other rays and illumination of surfaces other than the object by partially blocked light. The purpose is to provide a screen or Batsful (hereinafter referred to as "Batsful").

Yet another object of the invention is to provide an illumination device that achieves veil reflection elimination by means that do not require lenses, refractors or reflective elements.

Yet another object of the present invention is to provide improvements in the shape, structure and arrangement of several elements that can effectively achieve the aforementioned objectives.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Referring to FIGS. 1 and 2, the basic elements of a device for illuminating a work object, with or without indoor lighting, include a support such as a desk 10, and typically a reflector 12 and a housing 13. It includes a light source 11, such as a fluorescent lamp, and a support 14 for the light source, reflective member and housing. The support 14 may be a partition wall or a single wall as shown.
It may be a book or multiple pillars. The work area 15 of the work to be illuminated is placed on the desk, and the observation point (ie the observer's eye) is designated by the reference numeral 16.

A light source 1 that illuminates the task area 15 through an optical path 20
The light rays from 1 are reflected at the same angle to the optical path 21
It is clear that a veil reflex occurs which seriously interferes with the observation of tasks such as when reading printed materials. Clearly, sufficient illumination without veil reflections is desirable. To achieve this effect, the lighting equipment includes:
A buffle 25 is provided which is adjustably mounted on the housing 13 or on a support 26 having a rod 27. The baffle 25 is disposed adjacent to a portion of the light source 11 from which light rays cause veil reflection. Assuming that the observer is near the center of the desk and the work object is directly in front of the observer, the Batsuful 25 is located in the center of the opposing desk, in front of the light source, and directly in front of the observer. must be located so that the emitted light from the workpiece is completely or almost completely prevented from reaching the workpiece.

The final distribution of light rays is as shown in FIG. That is, the light rays from the portion 11 of the light source 11 located in front of the observer are prevented from reaching the task area 15 by the buffer 25 . However, the task area 15 is
is illuminated by light rays from both ends of the light source, as shown by. The rays closest to those that can cause veil reflections are marked with long crossed arrows 31.
It is shown by. As long as the observer at observation point 16 remains in a position sandwiched between diverging optical paths 31, no veil reflections occur. If the observer needs or desires to move to the right or left, lateral adjustment can be effected by moving the baffle 25 laterally on the housing 13 or on the support rod 27.

The baffle can be made from any suitable material or materials including metal, plastic, wood or glass. The baffle may be a solid elongated plate that is opaque or partially transparent, or it may be formed as a collection of shutter-like elements. Figures 2a and 2b illustrate this latter configuration. In this structure, a plurality of small flat plates 35 are mounted in an array of parallel plates angled in opposite directions on either side of a centerline 37 and formed at an acute angle to the axis of the light source 36. ing. The edges of each plate should appear to overlap or nearly overlap when viewed from a position in or near a vertical plane containing the centerline. By doing so, the light rays from the central part of the light source can hardly travel directly to the task area (assumed to be on the center line);
On the other hand, it moves freely along the light path that diverges to the left and right areas of the task. In this way, the loss of light energy in the luminaire is minimized.

The principle of the bidirectional single-sided shutter described above is similar to that of a batwing lens. The rays are e.g. to the right and left side of the front.
Although it can radiate at an angle of 30 degrees to 60 degrees,
Radiation directly in front is prevented.

In place of sliding movement, the baffle can be mounted such that it is placed on a rod or in a door frame slot, or within 12 inches of the light source and/or the transparent housing. It can also be adjusted in stages. Assuming that the task area is the most used during most of the user's working time, or assuming that the user's position is fixed, the position of the buttful can also be fixed.

The baffle must be large enough to block the light rays from the lamp and/or reflector and/or lens and/or scatterer. Batsuful therefore extends from approximately 10.16 cm (4 inches) left and right when measured along the axis of the light source.
It is 116.84 cm (46 inches). The baffle is placed directly in front of the lamp and/or reflector and/or lens and/or scatterer and/or transparent housing (between the light source and the viewing object).

Figures 4 and 5 show geometrical illustrations for determining the length of the buttful. Work area 15 is typically centered approximately 6 inches from the leading edge of the work surface.

Observation point 16 is typically located between the observer's seated and standing eye level, or approximately 7 inches (17.78 cm) to approximately 36 inches (92.44 cm) above the work surface. be. The height of the light source is approximately 25.4 cm above the work surface
cm (10 inches) to eye level while standing on the floor, e.g. from approximately 25.4 cm (10 inches) above the work surface.
It is 92.44 cm (36 inches). Working surface (W+15.24
cm) is typically 30.48cm (12 inches) to 121.92cm
(48 inches). In Figures 4 and 5, θ=tan ^-1 W/X Y=X/cos θ φ=shading angle x 1/2 (half of 20° to 45°) Z=Y tan φ Length of Batsuful 25 =2Z Although the armored baffle is shown in Figures 2a and 2b, opaque or transparent screens or clear buttwing lenses arranged to reflect the light laterally may also be used. The material may be metal, glass, plastic, cardboard or a linear polarizing material that produces a vertically polarized beam. The requirements in all cases except for linear deflectors are screen or buttful (hereinafter referred to as
Collectively, they are called "Batsuful." ) must completely or partially block radiation from the light source in a direction that could cause veil reflections on the workpiece. Vertically polarized light inherently reduces veil reflection.

In the present invention, the light beam from the light source illuminates the work object, but it must be at an angle that does not cause veil reflection.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a desk, a lighting fixture according to an embodiment of the present invention, and a buttful, and the position of an observer in a normal position is indicated by a dotted line. FIG. 2 is a front view of the desk, lighting equipment, and bathtub shown in FIG. 1. FIG. 2a is a front view of a fluorescent lamp and a typical buttful. Figure 2b is a plan view of the fluorescent lamp and bulb shown in Figure 2a. FIG. 3 is a schematic plan view showing the relative positions and optical paths of a light source, a buffer, a task area, and an observer.
FIG. 4 is an illustrative side view in a vertical plane of the battleship, task, and observer to illustrate specific dimensions and locations. FIG. 5 is an explanatory plan view to supplement FIGS. 3 and 4. FIG. DESCRIPTION OF SYMBOLS 10...Desk, 11...Light source, 12...Reflection member, 13...Housing, 14...Support, 15
...Task area, 16...Observation point, 20,21...
Optical path, 25...Battery, 26...Support, 27
... Rod, 30, 31 ... Ray, 35 ... Flat plate, 36 ... Light source.

Claims (1)

[Scope of Claims] 1. Supported on a substantially horizontal work surface,
a workpiece located laterally in the first direction and at a height between about 7 inches (17.78 cm) and about 36 inches (92.44 cm) above the work surface and adapted to be primarily viewed from the observation point; A task-oriented lighting device for illuminating a work object, comprising: a horizontal elongated linear light source having a long axis substantially perpendicular to the first direction; and a light source interposed between the light source and the work object; and a bulge extending laterally long enough to intersect all vertical planes containing the task object and the observation point, and adjustable along said axis, said light source being an element of a luminaire. The luminaire includes means for supporting a baffle, the baffle at least partially blocking light from the light source that causes veil reflections on the work object;
and the light source extends along said axis beyond the baffle so as to be sufficient to directly illuminate the task with a ray of light traveling along a vertical plane that does not include the observation point. 2. The object-oriented lighting system of claim 1, wherein said baffle comprises two groups of substantially parallel opaque shutter-like elements angled in opposite directions.