JP2019102318A - Optical assembly, lamp device and luminaire - Google Patents

Abstract

To provide an optical assembly capable of obtaining a wide and even light distribution characteristic.SOLUTION: An optical assembly 10 comprises a light guide body 12 and a light diffusion unit 13. The light guide body 12 has a columnar light guide column 17, an incident surface 18 provided on a base end-side end surface of the light guide column 17 and into which light is made incident from a light-emitting source 11, and a paraboloid 20 provided on a tip-side outer peripheral surface of the light guide column 17 and of which a diameter contracts toward the tip side of the light guide column 17. The light diffusion part 13 is provided at a tip-side center part of the light guide body 12. When a ratio (r/a) of a radius r of the light diffusion part 13 to a radius a of the tip-side end surface of the light-guide body 12 is defined as c, and a refractive index of the light guide body 12 is defined as n, the following relationship is established: c≥0.2128×n+0.56816192.SELECTED DRAWING: Figure 1

Description

  Embodiments of the present invention relate to an optical assembly using a light guide, a lamp device using the optical assembly, and a lighting device using the lamp device.

  2. Description of the Related Art Conventionally, in a lamp device using a light emitting source including a light emitting element, one using an optical assembly is known in order to bring the light spreading method and the light method closer to an incandescent lamp.

  In this optical assembly, a light guide is used, an incident surface on which light from a light emitting source is incident is provided on the proximal end side of the light guide, and a light diffusion portion is provided on the distal end side of the light guide. And the light which injected into the light guide from the light emission source is light-guided inside the light guide to the front end side, and is diffused and emitted from the front end side of the light guide.

  In such an optical assembly, wide and uniform light distribution characteristics can not be obtained unless the relationship between the tip of the light guide and the light diffusion portion is appropriate.

JP, 2014-241227, A

  The problem to be solved by the present invention is to provide an optical assembly, a lamp device and a lighting device capable of obtaining wide uniform light distribution characteristics.

  The optical assembly of the embodiment includes the light guide and the light diffusion portion. The light guide is provided on a cylindrical light guide column, an end face on the proximal end side of the light guide column, on which light is incident from the light source, and on an outer peripheral surface on the tip side of the light guide column It has a paraboloid that is diameter-reduced toward it. The light diffusion portion is provided at the center on the tip side of the light guide. Assuming that the ratio of the radius of the light diffusion portion to the radius of the end face of the light guide on the tip side is c, and the refractive index of the light guide is n, the relationship of c ≧ 0.2128 × n + 0.56816192 is satisfied.

  According to the present invention, it can be expected to obtain a wide and uniform light distribution characteristic.

FIG. 1 is a cross-sectional view of an optical assembly showing a first embodiment. It is a side view of an optical assembly same as the above. It is explanatory drawing of the paraboloid which the light guide of an optical assembly same as the above has. It is a graph which shows the relationship between the ratio c of an optical assembly same as the above, and a beam angle. It is a graph which shows the relationship of the ratio c used as the beam angle of 300 degrees of an optical assembly same as the above, and the refractive index n. It is a graph which shows the relationship between the ratio d of an optical assembly same as the above, and a beam angle. It is a graph which shows the relationship between ratio d of the critical point of an optical assembly same as the above, and refractive index n. It is a graph which shows the relationship of the ratio d used as the beam angle of 300 degrees of an optical assembly same as the above, and the refractive index n. It is sectional drawing of a lamp device using the optical assembly which shows 2nd Embodiment. It is a schematic front view of the illuminating device which used the same as the above lamp apparatus.

  Hereinafter, a first embodiment will be described with reference to FIGS. 1 to 8.

  An optical assembly 10 is shown in FIGS. 1 and 2. The optical assembly 10 includes a light emission source 11, a light guide 12, a light diffusion unit 13, and a light shield 14.

  The light emitting source 11 has a planar light emitting surface 11 a for emitting light. The light emission source 11 is configured by an SMD (Surface Mount Device) package using a LED as a light emitting element, a COB (Chip On Board) module, or the like. In addition, you may use organic EL etc. other than LED as the light emission source 11, for example.

  Moreover, the light guide 12 is formed of a transparent material with good light transmittance. Examples of the material include, for example, polycarbonate, glass, acrylic, and silicone.

  The light guide 12 is provided with a cylindrical light guide column 17. The central axis z of the light guiding column 17 is arranged to coincide with the optical axis of the light emitting source 11. At the end face on the proximal end side which is the one end side in the axial direction of the light guide column 17, an incident surface 18 for receiving the light from the light emitting source 11 is provided.

  A paraboloidal surface 20 is formed on the outer peripheral surface on the tip end side of the light guide pillar 17 so as to gradually decrease in diameter toward the tip end side of the light guide pillar 17. As shown in FIG. 3, the parabolic surface 20 has a focal point f on the tip side of the parabolic surface 20 on the opposite side with respect to the central axis z. The parabolic surface 20 is configured to totally reflect light having an angle of θ or less, which is guided in the light guide column 17 and is incident on the parabolic surface 20, toward the focal point f. The paraboloid 20 may be a compound paraboloid in which a plurality of paraboloids are continuously formed in the axial direction.

  A light diffusion portion 13 is provided along the axial direction at a central portion on the tip end side of the light guide pillar 17. Therefore, at the axial center portion on the tip end side of the light guide pillar 17, there is provided a recess 21 in which the light diffusion portion 13 is provided. The shape of the recess 21 corresponds to the shape of the light diffusion portion 13.

  An annular tip surface 22 is provided between the parabolic surface 20 and the light diffusion portion 13 (recess portion 21) on the end surface of the tip end side of the light guide column 17.

  In addition, the light diffusion portion 13 is formed of a light diffuse reflection material that diffusely reflects light. The light diffusion portion 13 is formed in a predetermined solid shape, and is integrated with the light guide 12 by insert molding when the light guide 12 is formed. Alternatively, after the light guide 12 having the recess 21 is formed, the inner surface of the recess 21 may be formed by applying or filling a light diffuse reflection material.

  On the surface of the light diffusion portion 13 in contact with the light guide 12, there is a cylindrical surface 25 located on the tip side of the light guide pillar 17, and a hemispherical facing that is the bottom of the cylindrical surface 25 and faces the incident surface 18 side. A face portion 26 is provided. The surface of the light diffusion portion 13 in contact with the light guide 12 is configured as a light diffusion reflection surface 27 that diffusely reflects light.

  The central axis of the light diffusion portion 13 is arranged to coincide with the central axis z of the light guide pillar 17. Furthermore, the light diffusion portion 13 is disposed along the axial direction of the light guide pillar 17, and the cylindrical surface portion 25 which is a circumferential surface of the light diffusion portion 13 is opposed to the paraboloid 20.

  Further, the light shield 14 covers the proximal end side of the light guide 12 and prevents the light of the light emitting source 11 from leaking to the outside. The light shield 14 is also a housing that supports the light guide 12. The light shielding body 14 includes a disk-shaped cover portion 31 having an insertion hole 30 through which the light guide 12 is inserted, and a peripheral wall portion 32 provided around the cover portion 31.

  At the opening end of the light shielding body 14, a base portion 33 provided with the light emitting source 11 is attached.

  Then, in the light source assembly 10 configured as described above, when the lighting power is supplied to the light emitting source 11, the light emitting source 11 emits light.

  The light emitted from the light emitting source 11 enters the light guide pillar 17 from the incident surface 18 and is guided in the light guide pillar 17 toward the tip side.

  Of the light guided in the light guiding column 17 toward the tip side, the light incident on the facing surface 26 of the light diffusion portion 13 is diffused and reflected by the facing surface 26 (light diffusive reflection surface 27), It is emitted to the outside of the body 12.

  Of the light guided inside the light guiding column 17 toward the tip side, the light traveling between the light diffusion portion 13 and the paraboloid 20 of the light guiding column 17 may be incident on the paraboloid 20 or may be diffused. The light is incident on the cylindrical surface portion 25 of the portion 13 and is emitted from the tip end surface 22 of the light guide 12.

  Light incident on the paraboloid 20 at an angle θ or less is totally reflected toward the focal point f by the paraboloid 20 and is incident on the cylindrical surface 25 of the light diffusion portion 13.

  Light incident on the cylindrical surface 25 of the light diffusion portion 13 is diffused and reflected by the cylindrical surface 25 (light diffusive reflection surface 27). The diffusely reflected light is incident on the parabolic surface 20 and the tip surface 22 and is transmitted or reflected according to the incident angle.

  Therefore, most of the light incident on the light guide 12 from the light emitting source 11 is diffusely reflected by the light diffusion portion 13 and emitted from the tip end side of the light guide 12 to a wide light distribution range.

  And in such an optical assembly 10, for example, in order to obtain a glittering feeling that the incandescent clear light bulb is lit, the cross-sectional area S of the light diffusion portion 13 along the central axis z is, for example, the light emission of the incandescent clear light bulb It is necessary to meet the conditions of small size and high brightness, which is equal to or less than that of the department.

Assuming that the cross-sectional area S of the light diffusion portion 13 is r, the diameter of the light diffusion portion 13 is r, the axial length of the cylindrical surface portion 25 of the light diffusion portion 13 is l, and the radius of the facing surface portion 26 of the light diffusion portion 13 is r
S = 2 × r × l + π × r ² ÷ 2
It is expressed by the equation of

Furthermore, the refractive index of the light guide 12 is n, the radius of the end face of the light guide 12 on the tip side, that is, the radius of the tip surface 22 which is the distance from the central axis z to the tip of the paraboloid 20, a Assuming that the axial length of the surface 20 is b and the maximum allowable angle of incidence on the paraboloid 20 (the maximum incidence angle of total reflection on the paraboloid 20) is θ,
b = a (1 + sin θ) / sin θ tan θ
θ = sin ⁻¹ (1 / n)
There is an expression of

Furthermore, the ratio (r / a) of the radius r of the cylindrical surface portion 25 of the light diffusing portion 13 to the radius a of the end face 22 of the light guide 12 is c, and the axial length of the paraboloid 20 of the light guide 12 is Assuming that the ratio ((l + r) / b) of the axial length of the light diffusion portion 13 to the height b (the axial length l of the cylindrical surface 25 + the radius r of the facing surface 26) is d
r = a × c
l + r = b x d
There is an expression of

If these equations are applied to the cross-sectional area S equation,
S = 2 × a × c × (b × d−a × c) + π × (a × c) ² ÷ 2
It is expressed as

And if it is going to satisfy the conditions of small size and high luminance which is equal to or less than the light emitting part of the incandescent clear bulb, for example, the cross-sectional area S of the light diffusion part 13
S ≦ 16.9 mm ²
You need to

  In addition, in such an optical assembly 10, in order to reproduce a wide and uniform light distribution characteristic, it is necessary to define an appropriate relationship between the paraboloid 20 and the tip surface 22 of the light guide 12 and the light diffusion portion 13. In addition, since the angle θ incident on the paraboloid 20 changes depending on the refractive index n of the material of the light guide 12, it is also necessary to consider the refractive index n of the material of the light guide 12.

  That is, in order to reproduce wide and uniform light distribution characteristics, the ratios c and d need to be defined in consideration of the relationship with the refractive index n.

  First, the ratio c will be described.

  FIG. 4 is a graph showing the relationship between the ratio c and the beam angle. FIG. 4 shows the change of the beam angle with respect to the change of the ratio c for each refractive index n of the material of the light guide 12. The beam angle indicates an angle of a range centered on the optical axis along the central axis z of the light guide 12, and the two directions in which the relative value of the luminous intensity distribution on the planar polar coordinates is 50% with respect to the maximum luminous intensity It is the angle that

  As can be seen from FIG. 4, the beam angle tends to increase as the ratio c increases. This is because the emission of light from the distal end surface 22 of the light guide 12 is suppressed, and the light is emitted from the distal end side of the light guide 12 toward a wide range.

  Furthermore, in the area of ratio c where the beam angle is lower than around 300 °, the beam angle varies due to the difference in refractive index n, but in the area of ratio c where the beam angle goes from around 300 ° to the upper side It was shown that the beam angle is correlated regardless of the difference in refractive index n.

  The beam angle is desirably about 300 °, preferably 300 ° or more, to reproduce a wide light distribution. The beam angle of 300 ° forms a total of 300 ° at 150 ° on both sides of the optical axis along the central axis z of the light guide 12.

  FIG. 5 is a graph showing the relationship between the ratio c at which the beam angle is 300 ° and the refractive index n. Each analysis value shown in FIG. 5 indicates the position of the ratio c at which the beam angle is 300 ° with the refractive index n of each material of the light guide 12. Linear (analytical value) is a line of the average value of the ratio c connecting analytical values.

  As can be seen from FIG. 5, it was shown that there is a correlation between the ratio c at which the beam angle is 300 ° and the refractive index n.

And the condition of the ratio c to reproduce a wide uniform light distribution characteristic with a beam angle of 300 ° is
c ≧ 0.2128 × n + 0.56816192
It is expressed by the equation of

  This equation of c is a line drawn by the value of the boundary line at which the beam angle is 300 ° at each refractive index n, and includes the refractive index 1.49 parallel to the linear (analytical value) line in FIG. Is a line of correction values corrected as above.

  Next, the ratio d will be described.

  FIG. 6 is a graph showing the relationship between the ratio d and the beam angle. FIG. 6 shows the change of the beam angle with respect to the change of the ratio d for each refractive index n of the material of the light guide 12.

  As can be seen from FIG. 6, the beam angle tends to increase as the ratio d increases. Furthermore, when the refractive index n is 1.52 or less, the change in the beam angle with respect to the change in the ratio d is switched so that the state in which the beam angle largely changes with respect to the change in the ratio d changes to a state with a moderate change. It was shown that there is a critical point where the rate changes rapidly.

  FIG. 7 is a graph showing the relationship between the critical point ratio d and the refractive index n. Each analysis value shown in FIG. 7 indicates the position of the ratio d of the critical point with the refractive index n of each material of the light guide 12. The linear (analytical value) is a line of the average value of the ratio d connecting the analytical values.

  As shown in FIG. 7, it was shown that there is a correlation between the critical point ratio d and the refractive index n.

And the condition of the ratio d that reproduces wide and uniform light distribution characteristics is
d ≧ −2.1911 × n + 4.0709
It is expressed by the formula of In addition, it is n <= 1.52.

  The equation of d is a linear (analytical value) line of FIG.

  In the case of n> 1.52, the ratio d has no critical condition, but in order to reproduce a wide and uniform light distribution characteristic, it is preferable to set dd0.7.

  Also, in the area of ratio d where the beam angle is lower than around 300 °, the beam angle varies due to the difference in refractive index n, but in the area of ratio d where the beam angle goes from around 300 ° to the upper side It was shown that the beam angle is correlated regardless of the difference in refractive index n.

  FIG. 8 is a graph showing the relationship between the ratio d at which the beam angle is 300 ° and the refractive index n. Each analysis value shown in FIG. 8 indicates the position of the ratio d at which the beam angle is 300 ° with the refractive index n of each material of the light guide 12. The linear (analytical value) is a line of the average value of the ratio d connecting the analytical values.

  As can be seen from FIG. 8, it was shown that there is a correlation between the ratio d at which the beam angle is 300 ° and the refractive index n.

And the condition of the ratio d to reproduce a wide uniform light distribution characteristic with a beam angle of 300 ° is
d ≧ −1.2944 × n + 2.7685786
It is expressed by the equation of

  The equation of d is a line drawn by the value of the boundary line at which the beam angle is 300 ° at each refractive index n, and is 1.43 in refractive index parallel to the linear (analytical value) line in FIG. 59 is a line of correction values corrected to include 59.

  The refractive index n of the light guide 12 is preferably in the range of 1.43 to 1.59. When the refractive index n is larger than this range, the number of times of light reflection in the light guide 12 increases, the loss increases, and the light extraction efficiency decreases. On the other hand, if the refractive index n is smaller than this range, it is necessary to reduce the size of the tip side of the light guide 12, thereby reducing the incidence of light to the tip side of the light guide 12. Light extraction efficiency decreases.

  Also, even if a beam angle of 300 ° of light emitted from the front end side of the light guide 12 is obtained, wide light distribution characteristics can not be obtained as the optical assembly 10 when blocked by the light shield 14. Become.

The conditions for reproducing a wide uniform light distribution characteristic with a beam angle of 300 ° as the optical assembly 10 including the light shielding member 14 are the central axis z of the light guide 12 (the optical axis of the light emitting source 11) and the peripheral part of the light shielding member 14 And a straight line connecting the intersection of the straight line x and the central axis z of the light guide 12 with the light diffusing portion 13 is y:
y / x 1.3 1.35
It is expressed by the equation of

  If this equation is satisfied, a wide light distribution characteristic with a beam angle of 300 ° can be obtained as the optical assembly 10.

  And according to the optical assembly 10 of the first embodiment, it is possible to reproduce a wide and uniform light distribution characteristic.

  That is, assuming that the ratio (r / a) of the radius r of the cylindrical surface portion 25 of the light diffusing portion 13 to the radius a of the distal end surface 22 of the light guide 12 is c and the refractive index of the light guide 12 is n, cc0 By satisfying the relationship of 2128 × n + 0.56816192, it is possible to reproduce a wide uniform light distribution characteristic with a beam angle of 300 °.

  Furthermore, the ratio of the axial length (the axial length l of the cylindrical surface 25 + the radius r of the facing surface 26) of the light diffusion portion 13 to the axial length b of the parabolic surface 20 of the light guide 12 Assuming that l + r / b) is d, wide uniform light distribution characteristics can be reproduced by satisfying the relationship of dd−2.1911 × n + 4.0709 and n ≦ 1.52.

  Alternatively, a wide uniform light distribution characteristic with a beam angle of 300 ° can be reproduced by satisfying the relationship d 広 く -1.2944 × n + 2.7685786.

Further, by satisfying the relationship of S ≦ 16.9 mm ² as the cross-sectional area S of the light diffusion portion 13 along the axial direction of the light guide 12, for example, a small size and height equal to or less than the light emitting portion of the incandescent clear bulb Luminescent part is obtained, and it is possible to reproduce a glittering feeling like an incandescent clear bulb.

  In addition, a straight line connecting the central axis z of the light guide 12 (the optical axis of the light emitting source 11) and the peripheral portion of the light shield 14 is x, and the intersection point of the straight line x and the central axis z of the light guide 12 Assuming that a straight line connecting the light diffusion portion 13 is y and the relationship of y / x と 1.35 is satisfied, a wide uniform light distribution characteristic with a beam angle of 300 ° is reproduced as the optical assembly 10 including the light shielding body 14 can do.

  And this optical assembly 10 can be used for various illumination applications, such as a light source of a light of vehicles, and a light source of lighting equipment.

  Next, FIG. 9 and FIG. 10 show a second embodiment.

  A lamp device 40 using the optical assembly 10 is shown in FIG. The lamp unit 40 is a bulb-shaped lamp that can be used by being connected to a socket for an incandescent lamp used for general lighting. The lamp device 40 is a candle type lamp using, for example, an E17 base or the like. The glove side is referred to as one end side or the tip side, and the power supply side is referred to as the other end side or the base end side.

  The lamp device 40 includes a housing 41. The heat dissipation plate 42, the optical assembly 10, and the globe 43 are disposed on one end side of the casing 41, and the insulating case 44 and the power supply unit 45 are disposed in the casing 41. The power supply unit 46 is disposed on the other end side of

  The housing 41 is formed of a metal material. The housing 41 is formed in a cylindrical shape in which the diameter on one end side is larger than the diameter on the other end side, and the diameter decreases from one end side to the other end side.

  The optical assembly 10 further includes a light emission source 11, a light guide 12, a light diffusion unit 13, and a light shield 14. The light emitting source 11 is disposed on the substrate 49 of the light emitting module. An attachment portion 50 is provided in a protruding manner on the circumferential surface on the proximal end side of the light guide 12. The light shield 14 includes a cover 51. The cover 51 has a conical shape, and an insertion hole 52 through which the light guide 12 is inserted is formed in the central portion. Inside the cover 51, a support 53 for holding the mounting portion 50 of the light guide 12 and positioning and supporting the light guide 12 is provided. In addition, in order to prevent light from leaking in the outer peripheral direction from between the substrate 49 and the cover 51 at the peripheral portion of the housing 41, the peripheral portion of the housing 41 is also included in a part of the light shielding body 14.

  The heat sink 42 is disposed on one end side of the housing 41 in contact with the substrate 49.

  The glove 43 is formed of, for example, a transparent material. Resin and glass are used as a transparent material. The globe 43 is hollow and formed in a substantially conical shape tapered toward one end, and the other end is open. The tip end side of the light guide 12 is disposed in the vicinity of the tip end side in the globe 43.

  Further, the insulating case 44 is formed in a cylindrical shape by a resin material having an insulating property. The insulating case 44 is inserted into the housing 41 and disposed.

  Further, the power supply unit 45 is accommodated in the insulating case 44. The power supply unit 45 converts an external power supply such as an AC power supply input from the power supply unit 46 into a lighting power supply such as a DC power supply, and supplies the lighting power supply 11 with the same. The power supply unit 45 includes a circuit board 55 and a plurality of circuit components (not shown) mounted on the circuit board 55. The input unit of the external power supply of the power supply unit 45 is electrically connected to the power supply unit 46 by wiring, and the output unit of the lighting power supply of the power supply unit 45 is electrically connected to the light emitting source 11 by wiring.

  Further, for the power supply unit 46, for example, a cap that can be connected to a socket for a general lighting incandescent lamp of E17 type is used. The feeding unit 46 may use another type of cap such as an E26 type according to the type of lamp. Further, the feeding part 46 is not limited to the base, but may be a pair of pins or the like depending on the type of lamp.

  Moreover, in FIG. 10, the schematic front view of the illuminating device 60 which uses the lamp apparatus 40 is shown. The illumination device 60 is, for example, a wall attachment, and a transparent light transmission cover 62 is disposed on the upper surface of the pedestal 61, for example, and a socket 63 is directed inside the light transmission cover 62 with the lamp connection direction upward. It is arranged.

  The lamp device 40 is mounted such that the tip end side of the globe 43 is directed upward by connecting the power supply unit 46 to the socket 63.

  Then, in the lighting device 60 to which the lamp device 40 is attached, when the external power supply is supplied to the lamp device 40 through the socket 63, the power supply unit 45 converts the external power supply into a predetermined lighting power and supplies it to the light emission source 11. Thereby, light is emitted from the light emitting source 11.

  The light emitted from the light emitting source 11 enters the light guide pillar 17 from the incident surface 18 of the light guide 12, and is guided inside the light guide pillar 17 toward the tip side. The light guided to the front end side of the light guide pillar 17 is diffused by the function of the light diffusion portion 13 and the like, and is emitted to a wide range. The light emitted from the light guide 12 passes through the globe 43 and is irradiated to the illumination space.

  When the lamp device 40 is lit, strong light is emitted from the front end side of the light guide 12, so that the glittering feeling as if the incandescent clear bulb is lit can be reproduced.

  And, according to the lamp device 40 of the second embodiment, by using the optical assembly 10 in which the relationship between the ratios c and d, the cross-sectional area S of the light diffusion portion 13 and y / x is defined as described above. While being able to realize a small-sized, high-intensity light emitting part similar to an incandescent clear light bulb, it is possible to reproduce wide uniform light distribution characteristics.

  Note that x in the y / x relationship in the second embodiment corresponds to the central axis z of the light guide 12 (the optical axis of the light emission source 11) and the peripheral portion of the casing 41 that is a part of the light shield 14. It is a straight line.

  The lamp device 40 may not have the power supply unit 45. In this case, a lighting power supply necessary for the light emitting source 11 may be supplied to the lamp device 40 from the power supply unit disposed on the appliance side, or no lighting unit is provided on the appliance side, and the lighting power supply via the power supply unit 46 May be supplied directly to the light emission source 11.

  While certain embodiments of the present invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

10 Optical assembly
11 Light source
12 light guide
13 Light diffuser
14 Light shield
17 light guiding column
18 plane of incidence
20 paraboloid
40 lamp unit
41 case
43 gloves
46 Power supply unit
60 lighting system
63 socket z central axis

Claims (7)

A cylindrical light guiding column, an incident surface provided on the proximal end face of the light guiding column for receiving light from the light emitting source, and an outer peripheral surface on the distal end side of the light guiding column facing the distal end of the light guiding column A light guide having a reduced diameter parabolic surface;
A light diffusing portion provided at the center on the tip side of the light guide;
Equipped with
Assuming that the ratio of the radius of the light diffusion portion to the radius of the end face of the light guide on the tip side is c, and the refractive index of the light guide is n, the relationship of c ≧ 0.2128 × n + 0.56816192 is satisfied. Optical assembly to be characterized. Assuming that the ratio () of the axial length of the light diffusion portion to the axial length of the paraboloid of the light guide is d, the relationship of d ≧ −2.1911 × n + 4.0709 is satisfied. An optical assembly according to claim 1, characterized in that Assuming that the ratio of the axial length of the light diffusion portion to the axial length of the paraboloid of the light guide is d, the relationship of d ≧ −1.2944 × n + 2.7685786 is satisfied. An optical assembly as claimed in claim 1.
Correlation The cross-sectional area S of the light diffusing portion along the axial direction of the lightguide claims 1 to 3 optical assembly of any one wherein a relation that S ≦ 16.9 mm ^2. A light shield covering the proximal end side of the light guide;
Let x be a straight line connecting the central axis of the light guide and the peripheral portion of the light shield, and y be a straight line connecting the light diffusion portion and an intersection point where the straight line x intersects the central axis of the light guide The optical assembly according to any one of claims 1 to 4, wherein y / x ≧ 1.35. Housing and
A light emitting source provided at one end of the housing;
The optical assembly according to any one of claims 1 to 5, provided at one end of the support opposite to the light emitting source;
A glove covering one end of the housing;
A feeding unit provided on the other end side of the housing;
A lamp device comprising: A lamp device according to claim 6;
A socket for connecting the feeding part of the lamp device;
A lighting device comprising:

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