Since many automotive cameras are affixed to the outside of vehicles, high chemical durability is needed for the front lens in particular.  When the chemical durability of the glass is good, the cloudiness due to corrosion on the lens surface is minimal even when in contact with outside air and therefore provides continued clear lens visibility.

Glass types with good Water resistance [RW(p)] Glass types with good Acid resistance [RA(p)]

Automotive cameras that are mounted outside of the vehicle are likely to be in contact with atmospheric dust and small rocks kicked up by other vehicles nearby. This may adversely affect camera lenses with scratches occurring on the surface of the lens. Therefore optical glass types which are not easily scratched should be included in front lens design. Glass types to consider that have good Impact Strength

Type	Code	nc	nd	nF	ng	vd	s.g.	Coloring
S-BSL7	516641	1.51386	1.51633	1.52191	1.52621	64.14	2.52	330/285
S-FSL5	487702	1.48534	1.48749	1.49228	1.49596	70.23	2.46	300/265
S-LAH55VS	835427	1.82899	1.83481	1.84852	1.85955	42.74	4.58	395/320
S-LAH65V	804466	1.79882	1.80400	1.81608	1.82569	46.58	4.72	385/315
S-LAH65VS	804465	1.79882	1.80400	1.81610	1.82573	46.53	4.46	380/310
S-LAL21	703524	1.69895	1.70300	1.71237	1.71976	52.38	3.85	395/320	More Info
S-LAL54Q	651562	1.64747	1.65100	1.65905	1.66532	56.24	3.36	385/-	More Info
S-PHM52Q	618633	1.61550	1.61800	1.62479	1.63008	63.32	3.51	365/325

 

Automotive cameras are set in various places both inside and outside of the vehicle. Since cars are used in environments where the temperature range can vary widely from below zero in colder climates to more than 50�C inside a car on a summer day, temperature change and thermal shock can drastically affect the imaging functionality of the camera lenses. In some cases, thermal stress can even lead to cracks in a lens. Therefore refractive index fluctuations should certainly be a consideration. By designing the automotive camera system to include optical glasses developed with thermal shock in mind, adjustments to temperature change can be handled within the optical system efficiently. Glass types to consider that have good Thermal Shock Resistance

Type	Code	nc	nd	nF	ng	vd	s.g.	Coloring
S-BSL7	516641	1.51386	1.51633	1.52191	1.52621	64.14	2.52	330/285
S-FSL5	487702	1.48534	1.48749	1.49228	1.49596	70.23	2.46	300/265
S-LAH55V	835427	1.82898	1.83481	1.84852	1.85956	42.73	4.73	400/325
S-LAH65V	804466	1.79882	1.80400	1.81608	1.82569	46.58	4.72	385/315
S-LAL21	703524	1.69895	1.70300	1.71237	1.71976	52.38	3.85	395/320	More Info
S-LAL7	652585	1.64821	1.65160	1.65934	1.66537	58.55	3.73	345/275
S-LAL54Q	651562	1.64747	1.65100	1.65905	1.66532	56.24	3.36	385/-	More Info
S-LAM60	743493	1.73865	1.74320	1.75372	1.76205	49.34	4.06	375/330
S-TIM8	596392	1.59103	1.59551	1.60621	1.61501	39.24	2.63	380/350

 

When the surrounding temperature changes, refractive indices may change as well. This refractive indices change is known as thermal coefficient of refractive indices, or dndT, and can vary depending on wavelength and/or temperature range. Automotive camera lens systems are set in various places both inside and outside of the vehicle. Since cars are used in environments with wide ranges in temperature, the refractive indices of the lens can change. As a result, the focal point can often shift and it may be impossible to obtain clear images. Therefore it is crucial to design automotive camera lens systems using a combination of optical glasses that do not change, even if the surrounding temperature does. dn/dT and Optical path length Change in temperature could cause a change in the refractive indices of optical glass and the material may expand as well. Therefore, in order to examine how the optical path length can change, both dn/dT and Coefficient of thermal expansion need to be considered. The relation between dn/dT and Coefficient of thermal expansion for Optical path length is as follows: Glass types to consider that have unique dn/dT

Type	Code	nc	nd	nF	ng	vd	s.g.	Coloring
S-FPL55	439948	1.43733	1.43875	1.44196	1.44444	94.66	3.59	335/290
S-LAH52Q	800422	1.79389	1.79952	1.81282	1.82356	42.24	4.47	390/335	More Info
S-LAH53V	806409	1.80026	1.80610	1.81995	1.83121	40.93	4.41	400/345
S-LAH60V	834372	1.82740	1.83400	1.84981	1.86283	37.21	4.43	430/350
S-LAH88	917316	1.90803	1.91650	1.93703	1.95418	31.60	4.74	(400)/355
S-LAL20	699511	1.69520	1.69930	1.70888	1.71647	51.11	4.38	370/310	More Info
S-LAM3	717479	1.71253	1.71700	1.72749	1.73587	47.92	4.25	385/340
S-LAM73	794371	1.78732	1.79360	1.80872	1.82119	37.09	4.45	415/350	More Info
S-NPH1W	808228	1.79801	1.80809	1.83351	1.85590	22.76	3.29	420/375
S-NPH7	778239	1.76902	1.77830	1.80157	1.82191	23.91	3.30	420/370	More Info

Glass types to consider that have similar optical properties, but different dn/dT

Type	Code	nc	nd	nF	ng	vd	s.g.	Coloring
S-BSL7	516641	1.51386	1.51633	1.52191	1.52621	64.14	2.52	330/285
S-LAH52	800422	1.79388	1.79952	1.81281	1.82355	42.22	4.41	400/330
S-LAH52Q	800422	1.79389	1.79952	1.81282	1.82356	42.24	4.47	390/335	More Info
S-LAH53	806409	1.80024	1.80610	1.81996	1.83117	40.92	4.49	405/340
S-LAH53V	806409	1.80026	1.80610	1.81995	1.83121	40.93	4.41	400/345
S-LAH60	834372	1.82738	1.83400	1.84982	1.86278	37.16	4.43	420/340
S-LAH60V	834372	1.82740	1.83400	1.84981	1.86283	37.21	4.43	430/350
S-LAH63	804396	1.79838	1.80440	1.81870	1.83034	39.59	4.34	410/340
S-LAH63Q	804396	1.79840	1.8044	1.81872	1.83043	39.58	4.45	415/345	More Info
S-LAL21	703524	1.69895	1.70300	1.71237	1.71976	52.38	3.85	395/320	More Info
S-LAL54	651562	1.64749	1.65100	1.65908	1.66543	56.16	3.82	365/325
S-LAL54Q	651562	1.64747	1.65100	1.65905	1.66532	56.24	3.36	385/-	More Info
S-NPH1	808228	1.79801	1.80809	1.83351	1.85590	22.76	3.29	445/375

   

Wavelengths that are longer than the range visible to human eyes are designated as the infrared region. There are three types:

• Far-infrared (FIR) – used primarily for thermography
• Mid-infrared (MIR) – used primarily for laser processing
• Near-infrared (NIR) – used at night or in dark environments for ‘night-vision’ camera

    Ohara supplies values for cameras used at NIR. Automotive Cameras in Near-infrared (NIR) Optical lens systems used for automotive cameras need to have a certain degree of clear visibility at night as well as during the day.  If an optical system has been optimized to correct aberration in the visible region, the aberration in the near-infrared region (NIR) will still have issues with image blurring due to limited light. By correcting aberration up to NIR, clear images can be obtained during day or night. Glass types to consider that have unique

Type	Code	nc	nd	nF	ng	vd	s.g.	Coloring
S-FPL51	497816	1.49514	1.49700	1.50123	1.50451	81.54	3.62	340/290
S-FPL53	439950	1.43733	1.43875	1.44195	1.44442	94.93	3.62	330/275
S-FPL55	439948	1.43733	1.43875	1.44196	1.44444	94.66	3.59	335/290
S-BAL2	571508	1.56762	1.57099	1.57886	1.58514	50.80	2.89	370/335
S-BAL3	571530	1.56810	1.57135	1.57889	1.58489	52.95	2.98	360/330
S-LAH63Q	804396	1.79840	1.8044	1.81872	1.83043	39.58	4.45	415/345	More Info
S-LAL20	699511	1.69520	1.69930	1.70888	1.71647	51.11	4.38	370/310	More Info
S-LAL21	703524	1.69895	1.70300	1.71237	1.71976	52.38	3.85	395/320	More Info
S-LAM73	794371	1.78732	1.79360	1.80872	1.82119	37.09	4.45	415/350	More Info
S-NBH5	654397	1.64923	1.65412	1.66571	1.67517	39.68	3.02	370/325
S-NBH8	720347	1.71437	1.72047	1.73512	1.74723	34.71	3.19	390/330
S-NBH51	750353	1.74326	1.74950	1.76447	1.77681	35.33	3.29	400/330
S-NBH52V	673383	1.66779	1.67300	1.68538	1.69551	38.26	3.01	360/320
S-NBH53V	738323	1.73132	1.73800	1.75415	1.76762	32.33	3.19	385/330
S-NBH56	855248	1.84488	1.85478	1.87935	1.90045	24.80	3.49	(395)/360
S-NBH58	789284	1.78076	1.78880	1.80850	1.82518	28.43	3.33	410/345	More Info
S-NBM51	613443	1.60925	1.61340	1.62311	1.63091	44.27	2.93	350/320
S-NPH7	778239	1.76902	1.77830	1.80157	1.82191	23.91	3.30	420/370	More Info
S-PHM52	618634	1.61504	1.61800	1.62479	1.63010	63.33	3.67	370/325
S-PHM52Q	618633	1.61550	1.61800	1.62479	1.63008	63.32	3.51	365/325
S-PHM53	603655	1.60019	1.60300	1.60940	1.61438	65.44	3.51	360/300