DE202010010082U1 - Flashlight with rotationally symmetrical attachment optics - Google Patents

Abstract

Flashlight with an optical axis (26) rotationally symmetrical attachment optics (4) having an outer reflector part (22), an inner Sammellinsenteil (21) and a rear surface (23) with a blind hole (24), and one on a disc-shaped Holder (6) arranged light-emitting diode (LED) (5), characterized in that the attachment optics (4) relative to the LED (5) is so limited by 2 stops displaced that at a plant of the attachment optics (4) on the holder (6 ) a substantially homogeneous cone of light is generated.

Description

The The present invention relates to a flashlight with a to a optical axis rotationally symmetrical attachment optics, which is an outer reflector part, an inner collection lens part and a rearward Has area with a blind hole, and one on a disc-shaped holder arranged light emitting diode (LED).

Flashlights of the type mentioned with the described attachment optics are basically known in the prior art. For example, in the US 2,254,962 described different attachment optics, wherein a light source within the rear blind hole bore is displaceable to change the emission characteristics. The light source between two points along the axial axial movement, both of which are arranged within the blind hole. By a linear movement of the light source, the opening angle of a light cone is essentially changed, so that objects can be illuminated at different distances.

adversely on the known flashlights with the described attachment optics is that the light intensity within the light cone is not uniform, which is usually the Intensity on the optical axis greatest is as it steadily decreases toward the edge of the light cone.

It Therefore, the object of the present invention is a flashlight to create with an attachment optics in which the above described Disadvantages are resolved. In particular, a flashlight is created be in which the radiation characteristic between a so-called Moon position and a focus position can be adjusted. In the Moon position becomes a cone of light with a large opening angle and generates homogeneous light distribution therein. In contrast, is the focus position by a cone of light with a comparatively small opening angle characterized. The ease of use of the flashlight should be as simple as possible be, making the desired setting fast and reliable can be found

These Problem is solved by the flashlight according to claim 1, according to the invention, the front optics opposite the LED so limited by two stops displaced is that in a plant of the attachment optics to the holder a substantially homogeneous light cone is generated.

The Radiation characteristic of the flashlight according to the invention is essentially defined by two settings, viz a focus position where the LED is maximized Distance to the attachment optics and the moon position, in which the Attachment optics with the holder in attachment, so that the LED is almost at the level of the rear surface to lie comes. In the focus position, the radiated light is on a relatively small cone of light, so that objects in large Distance can be illuminated. At the moon position on the other hand, it becomes a cone of light with as large an angle as possible generated, wherein the light distribution in the inventive Flashlight within the cone of light evenly is and falls sharply towards the edge. This will be a created particularly homogeneous illumination. By the invention Construction can make the preferred setting of the flashlight fast to be chosen without laboriously the correct distance between the header optics and the LED search.

advantageous Embodiments of the present invention are hereinafter as well as described in the subclaims.

To A first embodiment provides that the linear movement the optical attachment along the optical axis by another stop limited, the largest possible Distance between the LED and the attachment optics forms, with the LED is in this position in the focal point of the attachment optics. ever after construction of the flashlight, this stop is by ever a stop surface on the flashlight housing and the lamp head or formed within a connecting element. The moon position, where the light is homogeneous within a defined Light cone is radiated, is then optimally adjusted, if the holder in contact with the stop surface of the attachment optics is and therefore the LED with the stop surface plane almost coincides.

to Derivation of the resulting heat is preferably provided that the holder thermally conductive surfaces has, which are in contact with the housing. For example can this purpose an annular contact surface be provided on the underside of the holder, with which he is on one socket-shaped projection inside the housing is applied. As preferred materials for the thermally conductive Surfaces are in particular aluminum, copper or Brass.

Of the Sammellinsenteil is preferably by two different strengths convex curved surfaces bounded, where the radius the light entrance surface is larger than the radius of the light exit surface.

Further preferred embodiments and specific embodiments The present invention will be described below with reference to FIGS explained. Showing:

1a , b: one embodiment of a he inventive flashlight in two different settings,

2 : a front optics and

3 : a schematic representation of the radiation characteristic of a front optics.

After a specific embodiment of a flashlight according to the invention 1 this has a housing 2 , a lamp head 3 , a front optics 4 as well as an LED 5 , Here is the intent optics 4 in the lamp head 3 attached, the opposite the case 2 is longitudinally displaceable. The housing side is the LED 5 on a holder 6 attached, so that overall the attachment optics is displaceable relative to the LED. The displacement of the lamp head 3 or the attachment optics 4 is limited by two stops. On the one hand, the holder forms 6 with the attachment optics 4 a plant, including the attachment optics 4 one as a stop surface 7 having trained rear surface. On the other hand, in the illustrated embodiment, the displacement by a connecting element 8th possible, that the lamp head 3 and the case 2 connects to each other and has a (not shown) stop.

1a shows a setting in which the attachment optics 4 with the holder 6 in conditioning, so the LED 5 almost coincides with the stop surface plane. In this setting, the emission is characterized by a large emission angle, within which the light distribution is homogeneous. 1b In contrast, shows a focused setting where the intent optics 4 and the holder are arranged at a distance A from each other.

The intent optics 4 has an inner collection lens part 21 , an outer reflector part 22 and a rear surface 23 making a blind hole 24 has. The blind hole 24 is by a cone-shaped lateral surface 25 limited, the opposite to the longitudinal axis 26 has an opening angle α.

3 schematically shows the beam path in a focused setting, with the LED 5 emitted light rays on the collecting lens part 21 meet, which are radiated at an angle β. These light rays are from the collection lens part 21 to a cone of light 31 bundled with a cone angle γ. The remaining light rays are at an angle δ from the LED 5 emitted and hit the reflector part 22 , which is an axis-parallel beam 32 generated.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• US 2254962 [0002]

Claims (4)

Flashlight with one to an optical axis ( 26 ) rotationally symmetrical attachment optics ( 4 ), which has an outer reflector part ( 22 ), an inner collection lens part ( 21 ) and a rear surface ( 23 ) with a blind hole ( 24 ), and one on a disk-shaped holder ( 6 ) arranged light emitting diode (LED) ( 5 ), characterized in that the attachment optics ( 4 ) opposite the LED ( 5 ) is so limited by 2 stops limited, that in a system of the optical attachment ( 4 ) on the holder ( 6 ) a substantially homogeneous cone of light is generated. Flashlight according to claim 1, characterized in that the linear movement of the attachment optics ( 4 ) is limited along the optical axis by a further stop, the maximum distance between the LED ( 5 ) and the attachment optics ( 4 ), the LED ( 5 ) in this position in the focal point of the optical attachment ( 4 ) lies. Flashlight according to one of claims 1 or 2, characterized in that the holder ( 6 ) has thermally conductive surfaces which are in contact with a housing ( 2 ) are. Flashlight according to one of claims 1 to 8, characterized in that the collecting lens part ( 21 ) is bounded by two differently strongly convex curved surfaces, wherein the radius of the light entry surface is greater than the radius of the light exit surface.