JP2015133257A - Straight tube type led lamp and luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a straight tube type LED lamp which can reduce uncomfortable glare by greatly reducing the Unified Glare Rating (UGR) without depending on a lighting fixture shape, and which can contribute to improvement of versatility.SOLUTION: An LED 12 mounted on an LED substrate 11 is covered by a lens part 50. A second lens 50d is formed which is located closer to a cover (observer side) than a first lens in a front direction of a first lens 50b and whose curvature radius is smaller than that of the first lens. The second lens 50d is configured by forming a hemispherical space 50c communicating with a space 50a inside the lens part 50. The centers of the first lens 50b and the second lens 50d are located on a normal line of the center of a light emitting surface of the LED 12. By the existence of the second lens 50d, an apparent area of the LED 12 can be reduced.

Description

  The present invention relates to a straight tube LED lamp using a semiconductor light emitting element such as an LED as a light source, and an illumination device including the straight tube LED lamp.

In recent years, straight tube lamps using LEDs (Light Emitting Diodes) as light sources have been commercialized.
Since the LED for illumination has been put into practical use in recent years, the luminous efficiency has been improved year by year.
With the progress of LED manufacturing technology, not only switching from an incandescent lamp but also switching from a fluorescent lamp (fluorescent tube) to a straight tube LED lamp has been proposed and implemented.
Compared to fluorescent lamps, straight tube LED lamps have many advantages such as long life, low power consumption, and low environmental impact because they do not use mercury.

Common commercially available fluorescent lamps include an annular tube fluorescent lamp and a rod-shaped straight tube fluorescent lamp.
Circular tube fluorescent lamps are mainly used in homes, and straight tube fluorescent lamps are used in a wide range of applications such as factories, offices and general households.
Generally, there are 40W type and 110W type as the straight tube type fluorescent lamps which are used in large quantities. For example, a 40W type straight tube fluorescent lamp has a tube length of 1198 mm and a G13 base.
The 110W-type straight tube fluorescent lamp has a tube length of 2367 mm and an R17d base.
The straight tube type LED lamp incorporates an LED unit having an LED substrate on which a plurality of LEDs are mounted in a longitudinal direction in a transparent cover and a metal frame.

Compared with a conventional volume light source such as a fluorescent lamp, an LED is close to a point light source and has a small light emitting area. In addition, the brightness in the front direction is large due to the high directivity.
For this reason, the illumination using LED as a light source has the disadvantage that it is very dazzling and uncomfortable glare (discomfort caused by glare) tends to increase.
As an index for evaluating unpleasant glare, there is an index called UGR (Unified Glare Rating) defined in JIS Z 9125.
In order to reduce UGR, it is effective to reduce the luminance value of the light source or to reduce the apparent light source area when viewed from the observer.

As a method for reducing the luminance value, a method of adding a prism-shaped unevenness to the cover surface and diffusing the surface is known.
As a method of reducing the apparent light source area, a method of providing a light shielding plate on a lamp is already known.
There is also known a configuration in which a biconvex lens portion is provided between the LED package housing recess and the exit recess positioned on the opposite side to optically attenuate glare creation light (for example, Patent Document 1).

However, in the method of adding prism-like irregularities to the cover surface, the effect of reducing the luminance value is slight and not satisfactory.
The method of reducing the apparent light source area is limited to a specially shaped lamp such as a light shielding plate, and there are restrictions on use.

  The present invention was devised in view of such a current situation, and is a straight tube LED lamp that can significantly reduce UGR without depending on the lamp shape, reduce uncomfortable glare, and contribute to improvement in versatility. The main purpose is provision.

  In order to achieve the above object, a straight tube LED lamp according to the present invention is a translucent LED attached to the case so as to cover a rod-like case and one side surface of the case over the entire longitudinal direction. A cover member, a plurality of semiconductor light emitting elements as light sources arranged along the longitudinal direction inside the cover member, and an inner side of the cover member provided to cover at least the front direction of the semiconductor light emitting element A lens portion, and the lens portion is positioned closer to the cover member than the first lens in the front direction of the first lens and the semiconductor light emitting element, and has a radius of curvature more than that of the first lens. And a second lens having a small size.

  According to the present invention, it is possible to significantly reduce UGR without depending on the lamp shape and reduce unpleasant glare, thereby contributing to improvement in versatility.

It is a figure for demonstrating the reason why UGR can be reduced by arrange | positioning a lens in the front direction of LED. It is a schematic sectional drawing of the structure which covers LED with a concave lens. It is a figure which shows the optical path when light injects from the observation side in the structure shown in FIG. It is a figure which shows the optical path when light injects from the observation side in the lens structure which concerns on one Embodiment of this invention. It is an outline sectional view of the fundamental composition of optical simulation. It is a figure which shows the result of the optical simulation in case it does not have a lens, (a) is a block diagram, (b) is the image figure which observed the luminance distribution from the front. It is a figure which shows the result of the optical simulation in case it has only a 1st lens, (a) is a block diagram, (b) is the image figure which observed the luminance distribution from the front. It is a figure which shows the result of the optical simulation in case it has a 1st lens and a 2nd lens, (a) is a block diagram, (b) is the image figure which observed the luminance distribution from the front. It is a characteristic view which shows the two-dimensional luminance distribution in each structure. It is a perspective view in the case of providing a lens part separately corresponding to each LED. It is the perspective view which looked at each lens part from the bottom face side. It is a figure which shows the example which integrally molded the several lens part, (a) is a perspective view of a use condition, (b) is the perspective view seen from the bottom face side, (c) is the xx line of (b). It is sectional drawing. FIG. 6 is a perspective view of an example in which a plurality of lens portions are integrally molded as a cylindrical lens. It is a disassembled perspective view of an illuminating device. It is a perspective view of the state where the cover of a straight tube form LED lamp was removed. It is a perspective view of the state where a part of a case of a straight tube type LED lamp was cut and a base was removed. It is a figure which shows the structure of a straight tube | pipe type LED lamp, (a) is a disassembled perspective view of the notch in one end part, (b) is a disassembled perspective view of the notch in the other end part. It is a figure which shows the mounting structure of a LED board, (a) is an exploded perspective view of one end part, (b) is an exploded perspective view of the other end part. It is the figure seen from the A direction of FIG. 15 in a straight tube | pipe type LED lamp. FIG. 17 is an enlarged perspective view of a portion B in FIG. 16. It is principal part sectional drawing which shows the fixation structure of the power supply board with respect to the housing | casing by a clamp. FIG. 20 is a diagram corresponding to FIG. 19 in a modified example.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First, based on FIG. 14 thru | or FIG. 19, the specific structure of the straight tube | pipe type LED lamp and illuminating device which concerns on this embodiment is demonstrated.
FIG. 14 is an exploded perspective view showing the appearance of the lighting device 200. The lighting device 200 includes a straight tube LED lamp 100 and a lighting fixture (lamp) 150 on which the straight tube LED lamp 100 is mounted.
The lighting fixture 150 is the same as a fixture for lighting a fluorescent lamp, and the terminals (4a to 4d) of the straight tube LED lamp 100 are inserted in accordance with the hole positions of the sockets 151a and 151b.
The commercial current flows from the terminals (4a to 4d) to the LED described later in the straight tube LED lamp 100, and the straight tube LED lamp 100 is turned on.

The straight tube LED lamp 100 mainly includes a rod-shaped housing 2, a cover 3 as a translucent cover member, and a cap 1 a and 1 b as a cap member that can be electrically connected to the lighting fixture 150. It is configured.
Here, the cover 3 is transparent. The cover 3 may be formed of a diffusing material that diffuses light.
The casing 2 is formed in a semi-cylindrical shape (cylindrical shape) whose cross-sectional shape is substantially the same in the longitudinal direction (axial direction).
In order to improve the function of radiating heat generated inside, the outer surface of the housing 2 is provided with irregularities (see FIG. 19) to increase the surface area.
The housing | casing 2 is formed with the metal material with large heat conductivity. Due to the cylindrical shape, the casing 2 having a uniform cross-sectional shape can be manufactured at low cost by a processing method such as extrusion molding or pultrusion molding.

As the metal material, an aluminum alloy or a magnesium alloy is often used, but other extruded materials may be used.
The unevenness of the outer peripheral portion can provide a heat dissipation function similar to that provided with ribs or heat dissipation fins.
Here, for the purpose of improving heat dissipation, the outer periphery of the housing 2 is provided with irregularities. However, if the insulation between the housing 2 and a drive board (power supply board) and electrical components described later can be secured, the inner periphery Irregularities may be provided on the surface.

The cover 3 has an outer diameter (curvature) substantially the same as the outer diameter of the housing 2 and is formed in a semicircular shape having an opening along the longitudinal direction of the housing 2.
That is, the cover 3 has an arc-shaped cross-sectional shape and has a size that covers one side surface of the housing 2 in the longitudinal direction.
As shown in FIG. 19, the cover 3 is attached in such a manner that an edge 33 is fitted into an axially extending groove 21 provided on the outer surface of the housing 2, and the integral configuration with the housing 2 is a cylindrical shape. .
As shown in FIG. 14, the caps 1 a and 1 b are provided so as to cover the outer surfaces at both ends of an integral configuration of the housing 2 and the cover 3.
As shown in FIG. 17, terminals 1 a and 1 b are equipped with terminals 4 a to 4 d that can be mounted on a lighting fixture (fluorescent lighting fixture) 150 that can turn on a fluorescent lamp.

Current is supplied to the power supply substrate 7 via the terminals 4a to 4d of the caps 1a and 1b and lead wires 6a and 6b extending from the connector 16 connected to the caps 1a and 1b.
There is no problem even if the terminals 4a to 4d and the lead wires 6a and 6b are electrically connected by a method such as direct soldering.
The bases 1a and 1b are fixed to the housing 2 by a plurality of screws 5a to 5d, so that the housing 2 and the cover 3 fitted thereto are integrated so as to be integrated.

The bases 1a and 1b may be fixed to the housing 2 by means such as caulking instead of screwing. The shapes of the caps 1a and 1b are substantially the same as the caps located at both ends of the existing fluorescent lamp.
Therefore, an LED lamp illumination device can be configured without requiring replacement of the luminaire by attaching the straight tube LED lamp 100 to the existing luminaire using the fluorescent lamp instead of the fluorescent lamp. Can do.
Thereby, compared with the case where a new lighting fixture is separately attached, the facility cost and the construction cost can be greatly reduced, and the labor and time for replacement work can be reduced.

As shown in FIG. 19, an LED substrate as a mounting substrate facing the cover 3 outside the flat portion (portion corresponding to a semicircular string) 32 of the housing 2 and inside the cover 3. 11 is fixed via a sheet 10 having adhesiveness.
The sheet 10 is preferably made of a material having good thermal conductivity (for example, a heat-dissipating silicone rubber) in order to easily transmit heat generated by the LED to the housing 2, that is, to promote heat dissipation.
The power supply substrate 7 is disposed inside the housing 2 along the inside of the flat portion 32.
As shown in FIG. 15, the LED board 11 is an elongated rectangular printed board, and includes an LED board 11a and an LED board 11b.

Corresponding to the divided configuration of the LED substrate 11, the sheet 10 is also divided in the longitudinal direction.
A plurality of LEDs 12 a and 12 b as examples of semiconductor light emitting elements (light sources) having an EL effect are mounted on the LED substrates 11 a and 11 b at predetermined intervals in the longitudinal direction of the housing 2.

  As shown in FIG. 16, the power supply substrate 7 is formed in an elongated rectangular shape extending in the longitudinal direction of the housing 2, and a plurality of electronic components 9 for DC power supply conversion are spaced apart in the longitudinal direction on the mounting surface. It is installed.

The current rectified to direct current by the electronic component 9 is supplied to the mounting boards 11a and 11b through the lead wires 13a and 13b shown in FIG.
The LED boards 11a and 11b are electrically connected by lead wires or jumper wires (not shown).
In the present embodiment, the mounting substrate (LED substrate) on which the semiconductor light emitting element is mounted has a two-series arrangement configuration, but one or three or more series arrangement configurations or a parallel configuration may be used.

Below, the structure of an LED unit is demonstrated in detail.
Before describing the specific configuration, the principle for reducing discomfort glare will be described.

The evaluation of discomfort glare for the lighting facility is performed by the following formula based on the indoor unified glare evaluation value (UGR).
Details of the UGR calculation method are defined in CIE 117: 1995.

  As is clear from the above formula, UGR decreases as the luminance value L decreases and the light source area decreases, that is, the solid angle ω decreases.

Based on FIG. 1, the reason why the UGR can be lowered by arranging the concave lens L in the front direction of the LED 12 will be described.
What is observed as the luminance may be considered as light entering the light receiving surface substantially in parallel.
In FIG. 1, when there is no concave lens L, the size of the LED 12 is observed as it is (length b).
When there is a concave lens L, an effect equivalent to observing “light emitting surface with enlarged observation region = a” can be obtained.
This means that the apparent area of the light source (LED 12) can be reduced.

In order to reduce the luminance and the light source area, it is effective to reduce the ratio of A′B ′ / AB.
In order to reduce the ratio, it is necessary to decrease the curvature of the concave lens L in FIG. 1 to increase the lens power and to increase the distance w between the light emitting surface and the lens main plane.

Here, as shown in FIG. 2, the case where the lens part 50 for UGR reduction is provided in the front direction of LED12 is considered.
Here, the “front direction” means the normal direction of the light emitting surface of the LED 12. At the center C of the light emitting surface of the LED 12, the intensity in Lambertian light distribution is maximized.
The lens unit 50 is formed of a transparent resin in a cylindrical shape, and a hemispherical space 50a is formed on the LED substrate 11 side.
That is, the lens unit 50 is a concave lens, and the LED 12 is located at the center of the space 50a and is covered with the lens unit 50.
Hereinafter, the incident surface of the lens unit 50 is referred to as a first lens 50b. In the following drawings, cross-sectional display by hatching of the LED substrate 11 is omitted as appropriate.

As shown in FIG. 3, considering the case where light enters from the observation side (light receiving surface side), the light follows the optical path 52.
For this reason, it does not contribute much to the expansion of the observation region (reduction of the apparent area of the light source). That is, the width of the light arrival position in the y direction from the center of the light emitting surface of the LED 12 is small.
In order to reduce UGR, as described above, it is necessary to increase the lens power in the front direction of the LED having the highest luminance and to increase the distance between the lens main plane and the LED.
However, as shown in FIG. 2, since the space interval S between the LED 12 and the cover 3 is narrow in the case of a straight tube type LED lamp, the radius of curvature of the lens is reduced and the distance between the lens main planes is increased. It is not compatible with doing.
As shown in FIG. 3, in this embodiment, the normal direction at the center of the light emitting surface of the LED 12 is the z direction (front direction), the longitudinal direction of the LED substrate 11 is the x direction, and the short direction perpendicular thereto is the y direction. It is said.

In order to solve the above problem, in the present invention, as shown in FIG. 4, the first lens 50b is positioned closer to the cover 3 than the first lens in the front direction of the first lens 50b, and has a smaller radius of curvature than the first lens. A second lens 50d was formed.
The second lens 50 d is configured by forming a hemispherical space 50 c that communicates with the space 50 a in the lens unit 50.
The center of the 1st lens 50b and the 2nd lens 50d is located on the normal line of the center of the light emission surface of LED12.

The width of the light arrival position in the y direction from the center of the light emitting surface of the LED 12 is larger than that in the case of FIG.
That is, by adding the second lens 50d having a small radius of curvature to the center of the first lens 50b, even if the space is limited, the radius of curvature of the lens can be reduced and the distance between the lens main planes can be reduced. It can be compatible with lengthening.

Actually, the result of the optical simulation about the effect when such a lens is provided is shown below.
In the model as shown in FIG. 5, the luminance distribution at an incident angle of 1 ° was simulated by the ray tracing method.
The light source area of the LED 12 is 1.0 × 1.0 mm, the light distribution of the LED 12 is Lambert light distribution, and the cover 3 is a transparent cover made of polycarbonate.

FIG. 6A shows a case where there is no UGR reduction lens. FIG. 6B is a simulation image diagram when the luminance distribution is observed from the front. The horizontal axis of the image diagram is the x direction, and the vertical axis is the y direction (hereinafter the same).
FIG. 7 shows a case where only the first lens is provided.
FIG. 8 shows the case of the present invention having a second lens in addition to the first lens.

Compared to the configuration of FIG. 6 (hereinafter referred to as “L0 configuration”), the configuration of FIG. 7 (hereinafter referred to as “L1 configuration”) shows a luminance reduction effect and a light source area reduction effect, but the effect is insufficient. .
On the other hand, in the configuration of FIG. 8 (hereinafter referred to as “L2 configuration”), it can be confirmed that the luminance reduction effect and the light source area reduction effect are very large.
FIG. 9 shows a two-dimensional luminance distribution when sliced in the horizontal direction (x-axis). It can be confirmed from FIG. 9 that the effect is very large.

As shown in FIG. 10, each lens unit 50 is arranged and fixed so as to individually cover the LEDs 12 mounted on the LED substrate 11 at intervals in the longitudinal direction.
FIG. 11 is a perspective view of each lens unit 50 as viewed from below.
Each lens unit 50 and the LED 12 may be fixed integrally and fixed to the LED substrate 11 as an LED package.
As shown in FIG. 12, several lens parts 50 may be formed as one lens unit 54 by integral molding.

Moreover, as shown in FIG. 13, you may form the lens part 50 corresponding to some LED12 as one cylindrical lens 56 by extrusion molding.
In this case, both the first lens 50b and the second lens 50d are continuous in the longitudinal direction of the LED substrate.
Also in the case of the lens unit 54 and the cylindrical lens 56, it can also be produced as an LED package by being fixed integrally with the LED 12.

In the above embodiment, the first lens 50b and the second lens 50d are formed by continuously providing a space inside one resin, but may be configured by combining separate concave lenses having different curvatures. Good. When it is integrally formed with one resin, it is easy to manufacture and is advantageous in terms of cost.
Moreover, although it was set as the structure which covers LED12 completely with the lens part 50, this invention is not limited to this.
For example, the front direction may be partially covered and fixed to one of the LED substrate 11 and the cover 3 via a leg portion that supports the lens unit 50.

The other structure of the straight tube | pipe type LED lamp 100 is demonstrated.
As described above, the power supply substrate 7 is installed inside the flat portion 32 of the housing 2.
If there is no electronic component on the surface opposite to the mounting surface of the electronic component 9 of the power supply board 7 and an insulating material such as paint is applied to the flat portion 32 to ensure electrical insulation, the two are brought into direct contact with each other. Can be made.
A recess 30 that can accommodate the power supply substrate 7 is formed inside the housing 2.

The power supply board 7 converts the current sent from the commercial power supply from alternating current to direct current, supplies the current to the LED boards 11a and 11b via the lead wires 13a and 13b, and lights the LEDs 12a and 12b.
As shown in FIG. 20, the power supply substrate 7 is inserted by inserting the clamp 15 so that the hole 24 provided in the end portion thereof matches the hole 25 provided in the flat portion 32 of the housing 2 (see FIG. 21). , Fixed to the housing 2.
The clamp 15 is a locking means for fixing one end of the power supply substrate 7 in the longitudinal direction to the housing 2.
Thereby, the position shift of the power supply board 7 in the longitudinal direction can be regulated.
The other end of the power supply substrate 7 is held by the lead wires 13a and 13b as described above.

The hole 25 provided in the housing 2 is selected outside the LED substrate 11b and closer to the base 1b (see FIG. 15).
That is, the clamp 15 is set on the side of the power supply substrate 7 close to the base 1b and is set on the outer side of the LED substrate 11b.
Thus, by arranging the clamp 15 on the outside of the LED substrate 11, the luminous flux of the LED is not lost and shaded.
In FIG. 19 and the like, the clamp 15 shows a protruding shape for easy understanding.
In practice, as shown in FIG. 21, when the clamp 15 is inserted and pushed in from the outside of the flat portion 32, the elastically deformable portion 15a spreads outward when it passes through the hole 24 of the power supply substrate 7.
Thereby, the power supply board 7 is fixed to the housing 2 by a one-touch operation.

  Since the heat dissipation effect is improved by making the outer periphery of the housing 2 uneven, and the power supply substrate 7 is installed in close contact with the flat portion 32 of the housing 2 and the adhesion is enhanced by the clamp 15. Heat from 7 can be efficiently released to the housing.

As shown in FIG. 19, the direction perpendicular to the power supply substrate 7 can be regulated by making the length under the clamp neck h <b> 1 and the (case flat portion thickness + power supply substrate thickness) h <b> 2 substantially the same. .
That is, the movement of the power supply substrate 7 in the thickness direction orthogonal to the longitudinal direction of the casing can be restricted.

The concave portion 30 includes a flat portion 32 and two ribs 31 a and 31 b as protrusions rising from the flat portion 32 in the thickness direction of the power supply substrate 7.
If the length L (see FIG. 16) of the ribs 31a and 31b is the same as the length of the housing 2, for example, extrusion processing is possible.
That is, it can be integrally molded simultaneously with the molding of the housing 2, and a reduction in manufacturing cost can be maintained.
Since the ribs 31a and 31b are formed in the flat portion 32, the space between the protrusions is formed on a flat surface.

As shown in FIG. 19, when the width of the power supply substrate 7 is D1, and the interval between the ribs 31a and 31b is D2, the relationship of D2> D1 is established.
That is, the width is set such that the power supply substrate 7 can be smoothly inserted into the recess 30.
The rib height H <b> 1 is set to a height substantially equal to the component mounting surface of the power supply substrate 7.
By doing so, even if the power supply substrate 7 tries to move in the left-right direction in the figure, it cannot get over the ribs 31a and 31b.

Therefore, the power supply substrate 7 is prevented from being displaced in the width direction (left-right direction) orthogonal to the longitudinal direction of the housing by the ribs 31a and 31b.
Thereby, disconnection of the lead wire (unintentional unlighting of the LED lamp) due to repeated displacement of the power supply substrate 7 in the width direction due to vibration during distribution or vibration due to an earthquake or the like can be suppressed.

Even when the power supply board 7 is slid and set in the housing 2, the ribs 31a and 31b can be used as guides, so that the positioning is easy and it can be inserted smoothly.
Since the casing 2 is formed into a cylindrical shape having the same cross-sectional shape by extrusion molding or pultrusion molding, the direction in which the power supply substrate 7 is inserted into the casing 2 may be from any end.
The height (H1) of the ribs 31a and 31b is set to a minimum height that can prevent the positional deviation of the power supply substrate 7 in the width direction. This is not a big increase.
That is, the mass of the housing increases, the housing is easily warped, and there is no fear of dropping due to vibration such as an earthquake.
On the contrary, since the rigidity in the longitudinal direction of the housing is improved by the reinforcing effect by the ribs, a secondary effect that it is difficult to bend can be obtained.

  As described above, by providing the ribs 31a and 31b by extrusion molding or the like, the movement of the power supply substrate 7 in the left-right direction is almost restricted.

When a necessary breakdown voltage against the leakage voltage cannot be secured between the housing 2 and the power supply substrate 7, a thin plate-like insulating member 41 capable of securing a breakdown voltage is provided between the two as shown in FIG.
The inner dimension of the insulating member 41 is set equal to or slightly larger than the substrate width E1 of the power supply substrate 7.
The outer dimension width E2 of the insulating member 41 is set to be larger than the rib interval E3 and can be inserted into the smooth.

The rib height H2 is also set larger than (insulating member thickness + power supply board thickness), but the power supply board 7 does not get over the ribs 31a and 31b even if it is lower than the insulating member height K1.
In the case of fixing with the clamp 15, the insulating member 41 can be fixed by inserting a hole in the insulating member 41 so as to be sandwiched between the housing 2 and the power supply substrate 7, and inserting the clamp 15 into the hole.
A hole (not shown) of the insulating member 41 is provided at a position where the power supply substrate 7 does not protrude from the insulating member 41 with the clamp 15 inserted.
A screw may be used instead of the clamp 15.
Even when the insulating member 41 is inserted, the movement of the power supply substrate 7 in the thickness direction is restricted by setting (case flat portion thickness + insulation member thickness + power supply substrate thickness) h3≈clamp neck length h1. can do.

  In the present embodiment, since the current flowing through the power supply substrate 7 does not flow through the housing 2 due to the presence of the insulating member 41, there is no risk of injury such as electric shock or fire.

  In each of the above-described embodiments, the straight tube LED lamp 100 is configured to be mounted on the lighting fixture 150 capable of lighting a fluorescent lamp, but may be configured to be mounted on a lighting fixture dedicated to LEDs.

The preferred embodiments of the present invention have been described above. However, the present invention is not limited to such specific embodiments, and unless specifically limited by the above description, the present invention described in the claims is not limited. Various modifications and changes are possible within the scope of the gist.
The effects described in the embodiments of the present invention are merely examples of the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

2 Housing 3 Cover as cover member 12 LED as plural semiconductor light emitting elements
DESCRIPTION OF SYMBOLS 100 Straight tube type LED lamp 50 Lens part 50b 1st lens 50d 2nd lens 150 Lighting fixture

Japanese Patent No. 5042381

Claims (6)

A rod-shaped housing;
A translucent cover member attached to the casing so as to cover one side surface of the casing over the entire longitudinal direction;
A plurality of semiconductor light emitting devices as light sources arranged along the longitudinal direction inside the cover member;
A lens portion provided inside the cover member so as to cover at least the front direction of the semiconductor light emitting element,
The lens unit includes a first lens and a second lens that is positioned closer to the cover member than the first lens in the front direction of the semiconductor light emitting element and has a smaller radius of curvature than the first lens. It has a straight tube LED lamp. In the straight tube | pipe type LED lamp of Claim 1,
A straight tube type LED lamp in which a first lens and a second lens are integrally molded. The straight tube type LED lamp according to claim 1 or 2,
A straight tube type LED lamp in which the lens portion corresponding to each of the plurality of semiconductor light emitting elements is integrally formed as a lens unit. In the straight tube | pipe type LED lamp of Claim 3,
A straight tube LED lamp in which the lens unit is formed as a cylindrical lens by extrusion molding. In the straight tube | pipe type LED lamp as described in any one of Claims 1-4,
A straight tube type LED lamp in which the cover member is formed of a diffusing material.   An illuminating device comprising: the straight tube LED lamp according to any one of claims 1 to 5; and a lighting fixture on which the straight tube LED lamp is mounted.

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